ATGN / Altigen Communications, Inc. - SEC-arkivering, Årsberetning, Fuldmagtserklæring

Altigen Communications, Inc.
US ˙ OTCPK

Grundlæggende statistik
CIK 1003607
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Altigen Communications, Inc.
SEC Filings (Chronological Order)
Denne side giver en komplet, kronologisk liste over SEC-arkiveringer, eksklusive ejerskabsregistreringer, som vi leverer andre steder.
January 20, 2012 SC 13D/A

ATGN / AltiGen Communications, Inc. / PESSIN NORMAN H - PESSIN NORMAN H SC 13DA 1-19-2012 Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 2)* AltiGen Communications (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) 021489109 Cusip Number Norman H. Pessin 366 Madison Avenue, 14th Floor New York, NY 10017 212-661-2670 CC: Steven Wolosky, Esq. Olshan, Grundman, Frome,

February 9, 2011 SC 13G/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b) (c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b) (Amendment No. 3)* Alti

sc13gza SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b) (c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b) (Amendment No. 3)* Altigen Communications, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 021489109 (CUSIP Number) December 31, 2010 (Date of Even

December 13, 2010 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

10-K 1 v20528410k.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended September 30, 2010 Or ¨ TRANSITION REPORT PURSUANT TO SECTION 13 Or 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 0

December 8, 2010 SC 13D/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 2)*

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 2)* AltiGen Communications (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) 021489109 Cusip Number Norman H. Pessin 366 Madison Avenue, 14th Floor New York, NY 10017 212-661-2670 CC: Steven Wolosky, Esq. Olshan, Grundman, Frome,

November 17, 2010 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): November 17, 2010 ALTIGEN COMMUNICATIONS, INC. (Exact name of Registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 000-27427 (Commission Fil

November 17, 2010 EX-99.1

AltiGen Communications, Inc. Condensed Consolidated Statements of Operations (Amounts in thousands, except per share data) (Audited) Fourth Quarter Ended Year Ended September 30 September 30 FY 2010 FY 2009 FY 2010 FY 2009 Net Revenue $ 3,804 $ 4,866

AltiGen Communications Reports Fourth Quarter Fiscal 2010 Results SAN JOSE, CA - (MARKET WIRE) – 11/17/2010 - AltiGen Communications, Inc.

November 2, 2010 S-8 POS

______________________________________________________ UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT THE SECURITIES ACT OF 1933 ALTIGEN COMMUNICATIONS, INC. (

Registration No. 333-82090 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ALTIGEN COMMUNICATIONS, INC. (Exact name of registrant as specified in its charter) Delaware 94-3204299 (State or other jurisdiction of incorporation or organization) (I.R.S Employer Identification Numb

November 2, 2010 S-8 POS

______________________________________________________ UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT THE SECURITIES ACT OF 1933 ALTIGEN COMMUNICATIONS, INC. (

Registration No. 333-121753 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ALTIGEN COMMUNICATIONS, INC. (Exact name of registrant as specified in its charter) Delaware 94-3204299 (State or other jurisdiction of incorporation or organization) (I.R.S Employer Identification Num

November 2, 2010 S-8 POS

______________________________________________________ UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT THE SECURITIES ACT OF 1933 ALTIGEN COMMUNICATIONS, INC. (

Registration No. 333-94783 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ALTIGEN COMMUNICATIONS, INC. (Exact name of registrant as specified in its charter) Delaware 94-3204299 (State or other jurisdiction of incorporation or organization) (I.R.S Employer Identification Numb

November 2, 2010 S-8 POS

______________________________________________________ UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT THE SECURITIES ACT OF 1933 ALTIGEN COMMUNICATIONS, INC. (

Registration No. 333-156482 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ALTIGEN COMMUNICATIONS, INC. (Exact name of registrant as specified in its charter) Delaware 94-3204299 (State or other jurisdiction of incorporation or organization) (I.R.S Employer Identification Num

November 2, 2010 S-8 POS

______________________________________________________ UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT THE SECURITIES ACT OF 1933 ALTIGEN COMMUNICATIONS, INC. (

Registration No. 333-160293 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ALTIGEN COMMUNICATIONS, INC. (Exact name of registrant as specified in its charter) Delaware 94-3204299 (State or other jurisdiction of incorporation or organization) (I.R.S Employer Identification Num

November 2, 2010 15-12G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13 AND 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934. Commission File Number: 000-27427 ALTIGEN COMMUNICATIONS, INC. (Exact name of registrant as specifi

November 2, 2010 S-8 POS

______________________________________________________ UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT THE SECURITIES ACT OF 1933 ALTIGEN COMMUNICATIONS, INC. (

Registration No. 333-117000 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ALTIGEN COMMUNICATIONS, INC. (Exact name of registrant as specified in its charter) Delaware 94-3204299 (State or other jurisdiction of incorporation or organization) (I.R.S Employer Identification Num

November 2, 2010 S-8 POS

______________________________________________________ UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT THE SECURITIES ACT OF 1933 ALTIGEN COMMUNICATIONS, INC. (

Registration No. 333-148404 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ALTIGEN COMMUNICATIONS, INC. (Exact name of registrant as specified in its charter) Delaware 94-3204299 (State or other jurisdiction of incorporation or organization) (I.R.S Employer Identification Num

October 18, 2010 SC 13D/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 1)*

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 1)* AltiGen Communications (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) 021489109 Cusip Number Norman H. Pessin 366 Madison Avenue, 14th Floor New York, NY 10017 212-661-2670 (Name, Address and Telephone Number of Person Aut

August 25, 2010 EX-99.1

AltiGen Communications Announces Plans for CEO Transition

EX-99.1 2 v195239ex99-1.htm Exhibit 99.1 AltiGen Communications Announces Plans for CEO Transition SAN JOSE, CA - 08/25/2010 - AltiGen Communications, Inc. (OTCQX: ATGN) (PINKSHEETS: ATGN), the leading provider of integrated Microsoft-based Unified Communications solutions, has today announced that effective October 1, 2010, Gilbert Hu will transition from his role as CEO to President of Asia Paci

August 25, 2010 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) August 19, 2010 AltiGen Communications, Inc.

August 12, 2010 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2010 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-27427 ALTIGEN COMMUNICATIONS

May 12, 2010 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED March 31, 2010 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-27427 ALTIGEN COMMUNICATION

April 30, 2010 10-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K/A Amendment No. 1

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K/A Amendment No. 1 (Mark One) x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended September 30, 2009 Or ? TRANSITION REPORT PURSUANT TO SECTION 13 Or 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 000-2

April 28, 2010 CORRESP

April 28, 2010

April 28, 2010 Securities and Exchange Commission Division of Corporate Finance Mail Stop 3720 100 F Street, N.

April 21, 2010 EX-99.1

AltiGen Communications Reports Second Quarter Fiscal 2010 Financial Results

AltiGen Communications Reports Second Quarter Fiscal 2010 Financial Results San Jose, CA – April 21, 2010 - AltiGen Communications, Inc.

April 21, 2010 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): April 21, 2010 ALTIGEN COMMUNICAT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): April 21, 2010 ALTIGEN COMMUNICATIONS, INC. (Exact name of Registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 000-27427 (Commission File N

March 15, 2010 25

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 25 NOTIFICATION OF REMOVAL FROM LISTING AND/OR REGISTRATION UNDER SECTION 12(b) OF THE SECURITIES EXCHANGE ACT OF 1934.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 25 NOTIFICATION OF REMOVAL FROM LISTING AND/OR REGISTRATION UNDER SECTION 12(b) OF THE SECURITIES EXCHANGE ACT OF 1934. Commission File Number 000-27427 AltiGen Communications, Inc., NASDAQ Stock Market LLC (Exact name of Issuer as specified in its charter, and name of Exchange where security is listed and/or registered)

March 5, 2010 EX-99.1

AltiGen Communications, Inc. Announces Intention to Trade on OTCQX Market

Exhibit 99.1 AltiGen Communications, Inc. Announces Intention to Trade on OTCQX Market SAN JOSE, CA – March 5, 2010 – AltiGen® Communications, Inc. (NASDAQ: ATGN), the leading provider of integrated Microsoft-based Unified Communications solutions, announced today its intention to seek the voluntarily delisting of its common stock from the NASDAQ Capital Market and relist on the OTCQX U.S. Premier

March 5, 2010 8-K

Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) March 5, 2010 AltiGen Communications, Inc.

February 10, 2010 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED December 31, 2009 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-27427 ALTIGEN COMMUNICAT

January 27, 2010 EX-99.1

AltiGen Communications Reports First Quarter Fiscal 2010 Financial Results

AltiGen Communications Reports First Quarter Fiscal 2010 Financial Results San Jose, CA – January 27, 2010 - - AltiGen Communications, Inc.

January 27, 2010 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): January 27, 2010 ALTIGEN COMMUNIC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): January 27, 2010 ALTIGEN COMMUNICATIONS, INC. (Exact name of Registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 000-27427 (Commission File

January 26, 2010 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

DEF 14A 1 a2196191zdef14a.htm DEF 14A QuickLinks - Click here to rapidly navigate through this document UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ý Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary P

December 28, 2009 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Use these links to rapidly review the document TABLE OF CONTENTS Item 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA PART IV Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended September 30, 2009 Or o TRANSITION REPORT PURSUANT

December 28, 2009 EX-10.14

Service Level Communication Protocols AltiGen Communications Software Assurance Plan Software Assurance Plan Software Assurance Plan Coverage and Term

Exhibit 10.14 [*]=CERTAIN INFORMATION HAS BEEN OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. AltiGen Communications, Inc. FISERV RESELLER AGREEMENT THIS FISERV DIRECT APPLICATION RESELLER AGREEMENT, together with any Applications, Addenda and Exhibits (“Agreement”) is made and entered into as of this 28th day of Au

December 28, 2009 EX-10.5

Lease Agreement (NNN) Basic Lease Information

Exhibit 10.5 Lease Agreement (NNN) Basic Lease Information Lease Date: April 16, 2009 Landlord: FSP Montague Business Center Corp., a Delaware corporation Landlord’s Address: c/o Franklin Street Properties 401 Edgewater Place, Suite 200 Wakefield, MA 01880 Tenant: AltiGen Communications, Inc., a Delaware corporation Tenant’s Address: 410 East Plumeria Drive San Jose, California 95134 Premises: App

November 30, 2009 SC 13G

UNITED STATES OMB APPROVAL SECURITIES AND EXCHANGE COMMISSION OMB Number: 3235-0145 Washington, D.C. 20549 Expires: December 31, 2010 Estimated average burden SCHEDULE 13G hours per response 11

Schedule 13G Page 1 of 5 SEC 1745 (6-00) Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.

November 18, 2009 EX-99.1

AltiGen Reports 20% Sequential Revenue Growth and Improved Gross Profit Margins for Fourth Quarter of Fiscal 2009

Exhibit 99.1 AltiGen Reports 20% Sequential Revenue Growth and Improved Gross Profit Margins for Fourth Quarter of Fiscal 2009 San Jose, CA ? November 18, 2009 - AltiGen Communications, Inc. (NASDAQ: ATGN), a leading provider of 100 percent Microsoft-based VoIP business phone systems and call center solutions, today reported financial results for its fiscal 2009 fourth quarter and year ended Septe

November 18, 2009 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): November 18, 2009 ALTIGEN COMMUNI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): November 18, 2009 ALTIGEN COMMUNICATIONS, INC. (Exact name of Registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 000-27427 (Commission Fil

October 20, 2009 SC 13D/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13D Under the Securities Exchange Act of 1934 (Amendment No. 6)* AltiGen Communications, Inc.

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13D Under the Securities Exchange Act of 1934 (Amendment No. 6)* AltiGen Communications, Inc. (Name of Issuer) Common Stock, $0.001 par value per share (Title of Class of Securities) 021489109 (CUSIP Number) Mr. Eric D. Wanger c/o Wanger Investment Management, Inc. 401 North Michigan Avenue, Suite 1301 Chicago, Illinois 60611 (312)

October 20, 2009 EX-99.1

JOINT FILING AGREEMENT

EXHIBIT 99.1 JOINT FILING AGREEMENT In accordance with Rule 13d-1(f) under the Securities Exchange Act of 1934, as amended, each of the undersigned does hereby consent and agree to the joint filing on behalf of each of them of a Statement on Schedule 13D and all amendments thereto with respect to AltiGen Communications, Inc. common stock, par value $0.001 per share, beneficially owned by each of t

September 30, 2009 SC 13D/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 1)*

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 1)* AltiGen Communications (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) 021489109 Cusip Number Norman H. Pessin 366 Madison Avenue, 14th Floor New York, NY 10017 212-661-2670 (Name, Address and Telephone Number of Person Aut

September 18, 2009 EX-99.1

ALTIGEN RECEIVES NOTIFICATION FROM NASDAQ RELATING TO MINIMUM BID PRICE

Exhibit 99.1 ALTIGEN RECEIVES NOTIFICATION FROM NASDAQ RELATING TO MINIMUM BID PRICE San Jose, CA, September 18, 2009 – AltiGen Communications, Inc. (NASDAQ: ATGN), a leading provider of 100% Microsoft-based VoIP business phone systems and Unified Communications solutions, announced today that it received notification, dated September 15, 2009, from the Nasdaq Stock Market (“Nasdaq”), that for the

September 18, 2009 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) September 15, 2009 AltiGen Communications, Inc. (Exact name of Registrant as specified in charter) Delaware 000-27427 94-3204299 (State or other jurisdiction of incorporation) (Commiss

September 3, 2009 SC TO-I/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 2 to SCHEDULE TO (Rule 13e-4) Tender Offer Statement Under Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 ALTIGEN COMMUNICATIONS, INC. (Name of Subject Compa

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 2 to SCHEDULE TO (Rule 13e-4) Tender Offer Statement Under Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 ALTIGEN COMMUNICATIONS, INC. (Name of Subject Company (Issuer) and Filing Person (Offeror)) Options to Purchase Common Stock, $0.001 par value (Title of Class of Securities) 021489109 (CUSIP Number of

August 19, 2009 SC TO-I/A

SECURITIES AND EXCHANGE COMMISSION

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 1 to SCHEDULE TO (Rule 13e-4) Tender Offer Statement Under Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 ALTIGEN COMMUNICATIONS, INC. (Name of Subject Company (Issuer) and Filing Person (Offeror)) Options to Purchase Common Stock, $0.001 par value (Title of Class of Securities) 021489109 (CUSIP Number of

August 19, 2009 EX-99.A.1.A

ALTIGEN COMMUNICATIONS, INC. OFFER TO EXCHANGE CERTAIN OUTSTANDING OPTIONS FOR NEW OPTIONS This document constitutes part of the prospectus relating to the AltiGen Communications, Inc. 1999 Stock Plan, the AltiGen Communications, Inc. 1994 Stock Opti

EX-99.A.1.A 2 v158551ex99-a1a.htm Exhibit (a)(1)(A) ALTIGEN COMMUNICATIONS, INC. OFFER TO EXCHANGE CERTAIN OUTSTANDING OPTIONS FOR NEW OPTIONS This document constitutes part of the prospectus relating to the AltiGen Communications, Inc. 1999 Stock Plan, the AltiGen Communications, Inc. 1994 Stock Option Plan and the AltiGen Communications, Inc. 2009 Equity Incentive Plan covering securities that h

August 14, 2009 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ý QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2009 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-27427 ALTIGEN COMMUNICATIONS

August 5, 2009 EX-99.A.1.D

ALTIGEN COMMUNICATIONS, INC. OFFER TO EXCHANGE CERTAIN OUTSTANDING OPTIONS FOR NEW OPTIONS WITHDRAWAL FORM FAX THIS ENTIRE WITHDRAWAL FORM TO ALTIGEN’S HR DEPARTMENT, ATTENTION: TAMIKA MASSEY-EVANS NO LATER THAN 9:00 P.M., PACIFIC TIME, ON SEPTEMBER

EX-99.A.1.D 7 v156266ex99a1d.htm Exhibit (a)(1)(D) COMPLETE AND RETURN THIS WITHDRAWAL FORM ONLY IF YOU HAVE CHANGED YOUR MIND AND YOU DO NOT WANT TO EXCHANGE SOME OR ALL OF YOUR ELIGIBLE OPTIONS. ALTIGEN COMMUNICATIONS, INC. OFFER TO EXCHANGE CERTAIN OUTSTANDING OPTIONS FOR NEW OPTIONS WITHDRAWAL FORM THE OFFER EXPIRES AT 9:00 P.M., PACIFIC TIME, ON SEPTEMBER 1, 2009, UNLESS THE OFFER IS EXTENDED

August 5, 2009 EX-99.A.1.B

MEMORANDUM TO ALL ELIGIBLE EMPLOYEES

EX-99.A.1.B 5 v156266ex99a1b.htm Exhibit (a)(1)(B) MEMORANDUM TO ALL ELIGIBLE EMPLOYEES From: Philip McDermott, Chief Financial Officer To: All Eligible Employees Date: August 5, 2009 I am pleased to announce that this morning, AltiGen launched a voluntary, one-time stock option exchange program to allow eligible employees who received certain stock option grants the opportunity to exchange those

August 5, 2009 EX-99.A.1.F

Form of Reminder E-mail — Dates may change if expiration date of Offer is extended

EX-99.A.1.F 9 v156266ex99a1f.htm Exhibit (a)(1)(F) Form of Reminder E-mail — Dates may change if expiration date of Offer is extended The AltiGen Communications, Inc. offer to exchange certain outstanding options for new options (referred to as the “Offer”) is still currently open. Please note that the Offer will expire at 9:00 p.m., Pacific Time, on September 1, 2009, unless we extend the Offer.

August 5, 2009 EX-99.A.1.A

ALTIGEN COMMUNICATIONS, INC. OFFER TO EXCHANGE CERTAIN OUTSTANDING OPTIONS FOR NEW OPTIONS August 5, 2009 ALTIGEN COMMUNICATIONS, INC. Offer to Exchange Certain Outstanding Options for New Options This offer and withdrawal rights will expire at 9:00

EX-99.A.1.A 4 v156266ex99a1a.htm Exhibit (a)(1)(A) ALTIGEN COMMUNICATIONS, INC. OFFER TO EXCHANGE CERTAIN OUTSTANDING OPTIONS FOR NEW OPTIONS This document constitutes part of the prospectus relating to the AltiGen Communications, Inc. 1999 Stock Plan, the AltiGen Communications, Inc. 1994 Stock Option Plan and the AltiGen Communications, Inc. 2009 Equity Incentive Plan covering securities that ha

August 5, 2009 EX-99.A.1.G

Notice to Eligible Employees Regarding Expiration of Offer Period

EX-99.A.1.G 10 v156266ex99a1g.htm Exhibit (a)(1)(G) Notice to Eligible Employees Regarding Expiration of Offer Period To: Eligible Employees From: Philip McDermott, Chief Financial Officer Date: [September 2, 2009] Subject: Expiration of Offer to Exchange As of 9:00 p.m. on Tuesday, September 1, 2009, we closed the AltiGen Communications, Inc. offer to exchange certain outstanding options for new

August 5, 2009 EX-99.A.1.C

ALTIGEN COMMUNICATIONS, INC. OFFER TO EXCHANGE CERTAIN OUTSTANDING OPTIONS FOR NEW OPTIONS ELECTION FORM OR FAX OR HAND DELIVER THIS ENTIRE ELECTION FORM TO ALTIGEN’S HR DEPARTMENT, ATTENTION: TAMIKA MASSEY-EVANS NO LATER THAN 9:00 P.M., PACIFIC TIME

EX-99.A.1.C 6 v156266ex99a1c.htm Exhibit (a)(1)(C) ALTIGEN COMMUNICATIONS, INC. OFFER TO EXCHANGE CERTAIN OUTSTANDING OPTIONS FOR NEW OPTIONS ELECTION FORM THE OFFER EXPIRES AT 9:00 P.M., PACIFIC TIME, ON SEPTEMBER 1, 2009, UNLESS THE OFFER IS EXTENDED Before signing this Election Form, please make sure you have received, read and understand the documents that make up this offer to exchange certai

August 5, 2009 SC TO-I

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO (Rule 13e-4) Tender Offer Statement Under Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 ALTIGEN COMMUNICATIONS, INC. Options to Purchase Common Stock, $0.001

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO (Rule 13e-4) Tender Offer Statement Under Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 ALTIGEN COMMUNICATIONS, INC. (Name of Subject Company (Issuer) and Filing Person (Offeror)) Options to Purchase Common Stock, $0.001 par value (Title of Class of Securities) 021489109 (CUSIP Number of Class of Securities

August 5, 2009 EX-99.A.1.E

Confirmation E-mail to Eligible Employees who Elect to Participate in the Offer to Exchange Certain Outstanding Options for New Options

EX-99.A.1.E 8 v156266ex99a1e.htm Exhibit (a)(1)(E) Confirmation E-mail to Eligible Employees who Elect to Participate in the Offer to Exchange Certain Outstanding Options for New Options AltiGen Communications, Inc. (“AltiGen” or the “Company”) has received your election form by which you elected to have some or all of your outstanding eligible options (those options with an exercise price greater

July 22, 2009 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): July 22, 2009 ALTIGEN COMMUNICATIONS, INC. (Exact name of Registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 000-27427 (Commission File Nu

July 22, 2009 EX-99.1

AltiGen Communications Reports Third Quarter Fiscal 2009 Results Q3 revenue of $4.1 Million, up 14% sequentially; Gross profit margins improve 6% sequentially

Exhibit 99.1 AltiGen Communications Reports Third Quarter Fiscal 2009 Results Q3 revenue of $4.1 Million, up 14% sequentially; Gross profit margins improve 6% sequentially San Jose, CA – July 22, 2009 - AltiGen Communications, Inc. (NASDAQ: ATGN), a leading provider of 100 percent Microsoft-based VoIP business phone systems and Unified Communications solutions, today reported financial results for

June 29, 2009 EX-4.2

ALTIGEN COMMUNICATIONS, INC. 2009 EMPLOYEE STOCK PURCHASE PLAN

EX-4.2 3 v153377ex4-2.htm Exhibit 4.2 ALTIGEN COMMUNICATIONS, INC. 2009 EMPLOYEE STOCK PURCHASE PLAN 1. Purpose. The purpose of the Plan is to provide employees of the Company and its Designated Subsidiaries with an opportunity to purchase Common Stock through accumulated payroll deductions. The Company's intention is to have the Plan qualify as an "employee stock purchase plan" under Section 423

June 29, 2009 S-8

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-8 REGISTRATION STATEMENT The Securities Act of 1933 ALTIGEN COMMUNICATIONS, INC. (Exact name of registrant as specified in its charter)

As filed with the Securities and Exchange Commission on June 26, 2009 Registration No.

June 29, 2009 EX-4.1

ALTIGEN COMMUNICATIONS, INC. 2009 EQUITY INCENTIVE PLAN

EX-4.1 2 v153377ex4-1.htm Exhibit 4.1 ALTIGEN COMMUNICATIONS, INC. 2009 EQUITY INCENTIVE PLAN 1. Purposes of the Plan. The purposes of this Plan are: to attract and retain the best available personnel for positions of substantial responsibility, to provide incentives to individuals who perform services to the Company, and to promote the success of the Company's business. The Plan permits the grant

June 4, 2009 EX-99.2

JOINT FILING AGREEMENT

EX-99.2 3 v151584ex99-2.htm EXHIBIT 99.2 JOINT FILING AGREEMENT In accordance with Rule 13d-1(f) under the Securities Exchange Act of 1934, as amended, each of the undersigned does hereby consent and agree to the joint filing on behalf of each of them of a Statement on Schedule 13D and all amendments thereto with respect to AltiGen Communications, Inc. common stock, par value $0.001 per share, ben

June 4, 2009 EX-99.1

Wanger Reiterates Opposition to AltiGen?s Special Meeting Proposals Repeats Call for Chairman to Step Down and Invites Shareholders to Continue Sharing Concerns

EXHIBIT 99.1 Wanger Reiterates Opposition to AltiGen’s Special Meeting Proposals Repeats Call for Chairman to Step Down and Invites Shareholders to Continue Sharing Concerns CHICAGO—(BUSINESS WIRE)—Wanger Investment Management, Inc., which manages the investments of the Wanger Long-Term Opportunity Fund II, LP, one of the largest shareholders of AltiGen Communications, Inc. (NASDAQ: ATGN) (“AltiGe

June 4, 2009 SC 13D/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13D Under the Securities Exchange Act of 1934 (Amendment No. 5)* AltiGen Communications, Inc.

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13D Under the Securities Exchange Act of 1934 (Amendment No. 5)* AltiGen Communications, Inc. (Name of Issuer) Common Stock, $.001 par value per share (Title of Class of Securities) 021489109 (CUSIP Number) Mr. Eric D. Wanger c/o Wanger Investment Management, Inc. 401 North Michigan Avenue, Suite 1301 Chicago, Illinois 60611 (312)

June 3, 2009 DEFA14A

SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant r Check the appropriate box: r Preliminary Proxy Statement r Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) r Definitive Proxy Statement x Definitive Additional Materials r Soliciting Material Pursuant to ?240.

May 28, 2009 8-K

Other Events, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) May 28, 2009 AltiGen Communications, Inc.

May 28, 2009 EX-99.1

ALTIGEN URGES VOTE ON EQUITY PLAN PROPOSALS

Exhibit 99.1 ALTIGEN URGES VOTE ON EQUITY PLAN PROPOSALS Fremont, CA, May 28, 2009 – AltiGen Communications, Inc. (NASDAQ: ATGN), a leading provider of 100% Microsoft-based VoIP business phone systems and Unified Communications solutions, today acknowledged receipt of a letter, dated May 15, 2009, from one of its stockholders, and published in the media, advocating a “no” vote on the recent propos

May 26, 2009 DEFA14A

SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant [X] Filed by a Party other than the Registrant [ ] Check the appropriate box: [ ] Preliminary Proxy Statement [ ] Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) [ ] Definitive Proxy Statement [X] Definitive Additional Materials [ ] Soliciting Material Pursuant to ?240.

May 26, 2009 EX-99.1

ALTIGEN POSTPONES SPECIAL MEETING OF STOCKHOLDERS; ANNOUNCES NEW LOCATION FOR HEADQUARTERS AND SPECIAL MEETING

Exhibit 99.1 ALTIGEN POSTPONES SPECIAL MEETING OF STOCKHOLDERS; ANNOUNCES NEW LOCATION FOR HEADQUARTERS AND SPECIAL MEETING Fremont, CA, May 22, 2009 – AltiGen Communications, Inc. (NASDAQ: ATGN), a leading provider of 100% Microsoft-based VoIP business phone systems and Unified Communications solutions, announced today that it has postponed its previously scheduled special meeting of stockholders

May 26, 2009 8-K

UNITED STATES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) May 22, 2009 AltiGen Communications, Inc.

May 19, 2009 EX-99.2

JOINT FILING AGREEMENT

EX-99.2 3 v150184ex99-2.htm EXHIBIT 99.2 JOINT FILING AGREEMENT In accordance with Rule 13d-1(f) under the Securities Exchange Act of 1934, as amended, each of the undersigned does hereby consent and agree to the joint filing on behalf of each of them of a Statement on Schedule 13D and all amendments thereto with respect to AltiGen Communications, Inc. common stock, par value $0.001 per share, ben

May 19, 2009 EX-99.1

Large AltiGen Shareholder Reports Growing Support for its Plan to Reject AltiGen?s Special Meeting Proposals

EXHIBIT 99.1 Large AltiGen Shareholder Reports Growing Support for its Plan to Reject AltiGen’s Special Meeting Proposals CHICAGO, IL. – May 19, 2009 – Wanger Investment Management, Inc., which manages the investments of the Wanger Long-Term Opportunity Fund II, LP, one of the largest shareholders of AltiGen Communications, Inc. (NASDAQ: ATGN) (“AltiGen”) with a stake in excess of 11% of the outst

May 19, 2009 SC 13D/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13D Under the Securities Exchange Act of 1934 (Amendment No. 4)* AltiGen Communications, Inc.

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13D Under the Securities Exchange Act of 1934 (Amendment No. 4)* AltiGen Communications, Inc. (Name of Issuer) Common Stock, $.001 par value per share (Title of Class of Securities) 021489109 (CUSIP Number) Mr. Eric D. Wanger c/o Wanger Investment Management, Inc. 401 North Michigan Avenue, Suite 1301 Chicago, Illinois 60611 (312)

May 18, 2009 EX-99.1

Large AltiGen Shareholder Rejects Special Meeting Proposals, Calls on Chairman to Step Down Wanger Investment Management Discloses Board Letter Attacking Leadership Entrenchment, Adoption of Poison Pill, Lack of Board Independence and Loss of Shareho

EX-99.1 2 v149996ex99-1.htm EXHIBIT 99.1 Large AltiGen Shareholder Rejects Special Meeting Proposals, Calls on Chairman to Step Down Wanger Investment Management Discloses Board Letter Attacking Leadership Entrenchment, Adoption of Poison Pill, Lack of Board Independence and Loss of Shareholder Value Invites Other AltiGen Shareholders to Join in Voicing and Discussing Concerns CHICAGO, IL – May 15

May 18, 2009 EX-99.4

JOINT FILING AGREEMENT

EXHIBIT 99.4 JOINT FILING AGREEMENT In accordance with Rule 13d-1(f) under the Securities Exchange Act of 1934, as amended, each of the undersigned does hereby consent and agree to the joint filing on behalf of each of them of a Statement on Schedule 13D and all amendments thereto with respect to AltiGen Communications, Inc. common stock, par value $0.001 per share, beneficially owned by each of t

May 18, 2009 SC 13D/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13D Under the Securities Exchange Act of 1934 (Amendment No. 3)* AltiGen Communications, Inc. (Name of Issuer) Common Stock, $.001 par value per share (Title of Class of Securities)

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13D Under the Securities Exchange Act of 1934 (Amendment No. 3)* AltiGen Communications, Inc. (Name of Issuer) Common Stock, $.001 par value per share (Title of Class of Securities) 021489109 (CUSIP Number) Mr. Eric D. Wanger c/o Wanger Investment Management, Inc. 401 North Michigan Avenue, Suite 1301 Chicago, Illinois 60611 (312)

May 18, 2009 EX-99.2

LETTER TO ALTIGEN BOARD OF DIRECTORS

EX-99.2 3 v149996ex99-2.htm EXHIBIT 99.2 LETTER TO ALTIGEN BOARD OF DIRECTORS Wanger Investment Management, Inc. 401 North Michigan Avenue, Suite 1301 Chicago, Illinois 60611 May 15, 2009 VIA FEDEX The Board of Directors AltiGen Communications, Inc. 4555 Cushing Parkway Fremont, California 94538 Gentlemen: As one of the largest shareholders of AltiGen Communications, Inc. (“AltiGen” or the “Compan

May 15, 2009 10-Q

UNITED STATES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q xQUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2009 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-27427 ALTIGEN COMMUNICATIONS

April 27, 2009 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) April 27, 2009 AltiGen Communications, Inc. (Exact name of Registrant as specified in charter) Delaware 000-27427 94-3204299 (State or other jurisdiction of incorporation) (Commission

April 27, 2009 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ý Filed by a Party other than the Registran

Use these links to rapidly review the document TABLE OF CONTENTS Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

April 23, 2009 EX-99.1

ALTIGEN COMMUNICATIONS ADOPTS STOCKHOLDER RIGHTS PLAN

Exhibit 99.1 ALTIGEN COMMUNICATIONS ADOPTS STOCKHOLDER RIGHTS PLAN Fremont, CA – April 23, 2009 - AltiGen Communications, Inc. (NASDAQ: ATGN), a leading provider of 100 percent Microsoft-based VoIP business phone systems and Unified Communications solutions, announced today that its board of directors has adopted a stockholder rights plan. Under the plan, AltiGen will issue a dividend of one (1) r

April 23, 2009 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) April 23, 2009 AltiGen Communication

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) April 23, 2009 AltiGen Communications, Inc.

April 23, 2009 EX-4.1

ALTIGEN COMMUNICATIONS, INC. COMPUTERSHARE TRUST COMPANY, N.A. as Rights Agent PREFERRED STOCK RIGHTS AGREEMENT Dated as of April 21, 2009 TABLE OF CONTENTS

Exhibit 4.1 ALTIGEN COMMUNICATIONS, INC. and COMPUTERSHARE TRUST COMPANY, N.A. as Rights Agent PREFERRED STOCK RIGHTS AGREEMENT Dated as of April 21, 2009 TABLE OF CONTENTS Page Section 1. Certain Definitions 1 Section 2. Appointment of Rights Agent 7 Section 3. Issuance of Rights Certificates 7 Section 4. Form of Rights Certificates 9 Section 5. Countersignature and Registration 9 Section 6. Tran

April 23, 2009 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 AltiGen Communications, Inc. (Exact name of registrant as specified in its charter) Delaware 94-3204299 (State of incorporation or organization) (IRS Employer I.D. No.) 4555 Cushing Parkway, Fremon

April 23, 2009 EX-3.3

CERTIFICATE OF DESIGNATION OF RIGHTS, PREFERENCES AND PRIVILEGES OF SERIES A PARTICIPATING PREFERRED STOCK OF ALTIGEN COMMUNICATIONS, INC.

EX-3.3 2 v146959ex3-3.htm Exhibit 3.3 CERTIFICATE OF DESIGNATION OF RIGHTS, PREFERENCES AND PRIVILEGES OF SERIES A PARTICIPATING PREFERRED STOCK OF ALTIGEN COMMUNICATIONS, INC. The undersigned, Gilbert Hu, does hereby certify: 1. That he/she is duly elected and acting Chief Executive Officer of AltiGen Communications, Inc., a Delaware corporation (the “Corporation”). 2. That pursuant to the author

April 23, 2009 EX-4.1

ALTIGEN COMMUNICATIONS, INC. COMPUTERSHARE TRUST COMPANY, N.A. as Rights Agent PREFERRED STOCK RIGHTS AGREEMENT Dated as of April 21, 2009 TABLE OF CONTENTS

Exhibit 4.1 ALTIGEN COMMUNICATIONS, INC. and COMPUTERSHARE TRUST COMPANY, N.A. as Rights Agent PREFERRED STOCK RIGHTS AGREEMENT Dated as of April 21, 2009 TABLE OF CONTENTS Page Section 1. Certain Definitions 1 Section 2. Appointment of Rights Agent 7 Section 3. Issuance of Rights Certificates 7 Section 4. Form of Rights Certificates 9 Section 5. Countersignature and Registration 9 Section 6. Tran

April 22, 2009 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): April 22, 2009 ALTIGEN COMMUNICATIONS, INC. (Exact name of Registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 000-27427 (Commission File N

April 22, 2009 EX-99.1

ALTIGEN COMMUNICATIONS REPORTS SECOND QUARTER FISCAL 2009 RESULTS

Exhibit 99.1 ALTIGEN COMMUNICATIONS REPORTS SECOND QUARTER FISCAL 2009 RESULTS Fremont, CA – April 22, 2009 - AltiGen Communications, Inc. (NASDAQ: ATGN), a leading provider of 100% Microsoft-based VoIP business phone systems and Unified Communications solutions, today reported financial results for its fiscal 2009 second quarter ended March 31, 2009. Gilbert Hu, AltiGen's CEO, stated, "The diffic

March 10, 2009 EX-10.22

AMENDMENT TO EXECUTIVE EMPLOYMENT AGREEMENT

Exhibit 10.22 AMENDMENT TO EXECUTIVE EMPLOYMENT AGREEMENT This Executive Employment Agreement (the ?Agreement?) is deemed effective as of January 1, 2009, by and between AltiGen Communications, Inc., existing under the laws of the State of Delaware with its principal office located at 4555 Cushing Parkway, Fremont, CA 94538 (the ?Company?), and Philip McDermott (?Executive?). NOW, THEREFORE, in co

March 10, 2009 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) March 10, 2009 AltiGen Communication

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) March 10, 2009 AltiGen Communications, Inc.

March 10, 2009 EX-10.21

EXECUTIVE EMPLOYMENT AGREEMENT

Exhibit 10.21 EXECUTIVE EMPLOYMENT AGREEMENT This Executive Employment Agreement (the ?Agreement?) is deemed effective as of January 1, 2009 by and between AltiGen Communications, Inc., existing under the laws of the State of Delaware with its principal office located at 4555 Cushing Parkway, Fremont, CA 94538 (the ?Company?), and Gilbert Hu (?Executive?). NOW, THEREFORE, in consideration of the m

February 18, 2009 EX-99.1

ALTIGEN REPORTS PERMISSION FOR TWO-MEMBER AUDIT COMMITTEE

Exhibit 99.1 ALTIGEN REPORTS PERMISSION FOR TWO-MEMBER AUDIT COMMITTEE Fremont, California – February 17, 2009 - AltiGen Communications, Inc. (Nasdaq: ATGN), a leading provider of next generation IP-PBX phone systems, today reported that it has received notice from The Nasdaq Stock Market (i) acknowledging receipt of notice from the Company on January 28, 2009, that due to the recent resignation o

February 18, 2009 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) February 17, 2009 AltiGen Communications, Inc. (Exact name of Registrant as specified in charter) Delaware 000-27427 94-3204299 (State or other jurisdiction of incorporation) (Commissi

February 12, 2009 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED DECEMBER 31, 2008 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-27427 ALTIGEN COMMUNICAT

February 12, 2009 SC 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G

Schedule 13G Page 1 of 5 SEC 1745 (6-00) Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.

February 12, 2009 SC 13G/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b) (c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b) (Amendment No. 2)* Alti

SC 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b) (c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b) (Amendment No. 2)* Altigen Communications, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 021489109 (CUSIP Number) December 31, 2008 (Date of Eve

January 28, 2009 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) January 26, 2009 AltiGen Communications, Inc. (Exact name of Registrant as specified in charter) Delaware 000-27427 94-3204299 (State or other jurisdiction of incorporation) (Commissio

January 28, 2009 EX-99.1

Eric D. Wanger Wanger Investment Management, Inc. 401 N Michigan Ave, Suite 1301 Chicago, Illinois 60611 312-245-8000 / [email protected]

Eric D. Wanger Wanger Investment Management, Inc. 401 N Michigan Ave, Suite 1301 Chicago, Illinois 60611 312-245-8000 / [email protected] January 26, 2009 VIA FEDEX AND EMAIL To the Shareholders and Board of Directors c/o Mr. Gilbert Hu, Chairman and CEO AltiGen Communications, Inc. 4555 Cushing Parkway Fremont, California 94538 Ladies and Gentlemen: On the morning of January 8th, I filed a Sch

January 21, 2009 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): January 21, 2009 ALTIGEN COMMUNIC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): January 21, 2009 ALTIGEN COMMUNICATIONS, INC. (Exact name of Registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 000-27427 (Commission File

January 21, 2009 EX-99.1

ALTIGEN COMMUNICATIONS REPORTS RECORD FIRST QUARTER FISCAL 2009 REVENUE OF $4.9 MILLION, UP 14% YEAR-OVER-YEAR

ALTIGEN COMMUNICATIONS REPORTS RECORD FIRST QUARTER FISCAL 2009 REVENUE OF $4.9 MILLION, UP 14% YEAR-OVER-YEAR Fremont, CA – January 21, 2009 - - AltiGen Communications, Inc. (NASDAQ: ATGN), a leading provider of VoIP business phone systems and Unified Communications solutions for small-to-medium businesses (SMBs), today reported financial results for its fiscal 2009 first quarter ended December 3

January 12, 2009 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) January 8, 2009 AltiGen Communications, Inc. (Exact name of Registrant as specified in charter) Delaware 000-27427 94-3204299 (State or other jurisdiction of incorporation) (Commission

January 12, 2009 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ý Filed by a Party other than the Registran

QuickLinks - Click here to rapidly navigate through this document UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

January 8, 2009 SC 13D/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13D Under the Securities Exchange Act of 1934 (Amendment No. 2)* AltiGen Communications, Inc. (Name of Issuer) Common Stock, $.001 par value per share (Title of Class of Securities) (

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13D Under the Securities Exchange Act of 1934 (Amendment No. 2)* AltiGen Communications, Inc. (Name of Issuer) Common Stock, $.001 par value per share (Title of Class of Securities) 021489109 (CUSIP Number) Mr. Eric D. Wanger c/o Wanger Investment Management, Inc. 401 North Michigan Avenue, Suite 1301 Chicago, Illinois 60611 (312)

December 29, 2008 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ý ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended September 30, 2008 OR o TRANSITION REPORT P

QuickLinks - Click here to rapidly navigate through this document UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

December 29, 2008 S-8

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-8 REGISTRATION STATEMENT The Securities Act of 1933 ALTIGEN COMMUNICATIONS, INC. (Exact name of Registrant as specified in its charter) Delaware 94-3204299 (State or other jurisdiction

As filed with the Securities and Exchange Commission on December 29, 2008 Registration No.

December 12, 2008 SC 13D/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13D Under the Securities Exchange Act of 1934 (Amendment No. 1)* AltiGen Communications, Inc. (Name of Issuer) Common Stock, $.001 par value per share (Title of Class of Securities)

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13D Under the Securities Exchange Act of 1934 (Amendment No. 1)* AltiGen Communications, Inc. (Name of Issuer) Common Stock, $.001 par value per share (Title of Class of Securities) 021489109 (CUSIP Number) Mr. Eric D. Wanger c/o Wanger Investment Management, Inc. 401 North Michigan Avenue, Suite 1301 Chicago, Illinois 60611 (312)

December 12, 2008 EX-99.1

JOINT FILING AGREEMENT

EXHIBIT 99.1 JOINT FILING AGREEMENT In accordance with Rule 13d-1(f) under the Securities Exchange Act of 1934, as amended, each of the undersigned does hereby consent and agree to the joint filing on behalf of each of them of a Statement on Schedule 13D and all amendments thereto with respect to AltiGen Communications, Inc. common stock, par value $0.001 per share, beneficially owned by each of t

November 12, 2008 EX-99.1

ALTIGEN COMMUNICATIONS REPORTS FISCAL 2008 FOURTH QUARTER AND YEAR END RESULTS Positive Cash Flow from Operations in Fourth Quarter Record Fiscal 2008 Revenue of $19 million, up 6% from Fiscal 2007

ALTIGEN COMMUNICATIONS REPORTS FISCAL 2008 FOURTH QUARTER AND YEAR END RESULTS Positive Cash Flow from Operations in Fourth Quarter Record Fiscal 2008 Revenue of $19 million, up 6% from Fiscal 2007 Fremont, CA – November 12, 2008 - AltiGen Communications, Inc.

November 12, 2008 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): November 12, 2008 ALTIGEN COMMUNI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): November 12, 2008 ALTIGEN COMMUNICATIONS, INC. (Exact name of Registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 000-27427 (Commission Fil

August 13, 2008 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ý QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2008 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-27427 ALTIGEN COMMUNICATIONS

July 23, 2008 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): July 23, 2008 ALTIGEN COMMUNICATI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): July 23, 2008 ALTIGEN COMMUNICATIONS, INC. (Exact name of Registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 000-27427 (Commission File Nu

July 23, 2008 EX-99.1

Contacts: Phil McDermott CFO AltiGen Communications 510-252-9712 [email protected] Kirsten Chapman / Cathy Mattison Investor Relations Lippert/Heilshorn & Associates 415-433-3777 [email protected] ALTIGEN COMMUNICATIONS REPORTS RECORD THIRD QUA

EX-99.1 2 v120651ex99-1.htm Contacts: Phil McDermott CFO AltiGen Communications 510-252-9712 [email protected] Kirsten Chapman / Cathy Mattison Investor Relations Lippert/Heilshorn & Associates 415-433-3777 [email protected] ALTIGEN COMMUNICATIONS REPORTS RECORD THIRD QUARTER FISCAL 2008 REVENUE - Delivered Revenue of $4.8 Million, Up 15% over Third Quarter 2007 - - Posted Gross Margins of 5

May 14, 2008 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2008 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-27427 ALTIGEN COMMUNICATION

April 23, 2008 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): April 23, 2008 ALTIGEN COMMUNICAT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): April 23, 2008 ALTIGEN COMMUNICATIONS, INC. (Exact name of Registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 000-27427 (Commission File N

April 23, 2008 EX-99.1

ALTIGEN COMMUNICATIONS REPORTS RECORD SECOND QUARTER FISCAL 2008 REVENUE - Delivered Revenue of $4.7 Million, Up 14% over Second Quarter 2007 - - Posted Gross Margins of 55.6%, Up from 54.1% Second Quarter 2007 -

Contacts: Phil McDermott Christiane Pelz CFO Investor Relations AltiGen Communications Lippert/Heilshorn & Associates 510-252-9712 415-433-3777 pmcdermott@altigen.

March 14, 2008 SC 13D

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13D Under the Securities Exchange Act of 1934 (Amendment No. __)* Altigen Communications, Inc. (Name of Issuer) Common Stock, $.001 par value per share (Title of Class of Securities)

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13D Under the Securities Exchange Act of 1934 (Amendment No. )* Altigen Communications, Inc. (Name of Issuer) Common Stock, $.001 par value per share (Title of Class of Securities) 021489109 (CUSIP Number) Eric Wanger c/o Wanger Investment Management, LLC 401 North Michigan Avenue, Suite 1301 Chicago, Illinois 60611 (312) 942-9232

February 14, 2008 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED DECEMBER 31, 2007 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-27427 ALTIGEN COMMUNICAT

February 7, 2008 SC 13G

Schedule 13G Page 1 of 5

Schedule 13G Page 1 of 5 SEC 1745 (6-00) Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.

February 4, 2008 SC 13G/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b)(c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b) (Amendment No. 1)* Altige

OMB APPROVAL OMB Number: 3235-0145 Expires: February 28, 2009 Estimated average burden hours per response.

January 28, 2008 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) December 18, 2007 AltiGen Communications, Inc. (Exact name of Registrant as specified in charter) Delaware 000-27427 94-3204299 (State or other jurisdiction of incorporation) (Commissi

January 23, 2008 EX-99.1

ALTIGEN COMMUNICATIONS REPORTS FIRST QUARTER FISCAL 2008 RESULTS - Delivers revenue of $4.3 million and record deferred revenue of $1.3 million - - Reaffirms guidance of annual fiscal 2008 revenue growth of 20% - 25% -

Contacts: Phil McDermott Christiane Pelz CFO Investor Relations AltiGen Communications Lippert/Heilshorn & Associates 510-252-9712 415-433-3777 pmcdermott@altigen.

January 23, 2008 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): January 23, 2008 ALTIGEN COMMUNIC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): January 23, 2008 ALTIGEN COMMUNICATIONS, INC. (Exact name of Registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 000-27427 (Commission File

January 3, 2008 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

QuickLinks - Click here to rapidly navigate through this document UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

December 28, 2007 S-8

SECURITIES AND EXCHANGE COMMISSION

As filed with the Securities and Exchange Commission on December 28, 2007 Registration No.

December 28, 2007 EX-4.2

ALTIGEN COMMUNICATIONS, INC. 1999 EMPLOYEE STOCK PURCHASE PLAN (AS AMENDED NOVEMBER 13, 2007)

ALTIGEN COMMUNICATIONS, INC. 1999 EMPLOYEE STOCK PURCHASE PLAN (AS AMENDED NOVEMBER 13, 2007) The following constitute the provisions of the 1999 Employee Stock Purchase Plan of AltiGen Communications, Inc. 1. Purpose. The purpose of the Plan is to provide employees of the Company and its Designated Subsidiaries with an opportunity to purchase Common Stock of the Company through accumulated payrol

December 27, 2007 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

QuickLinks - Click here to rapidly navigate through this document UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

December 27, 2007 EX-10.29

ALTIGEN COMMUNICATIONS INC. DISTRIBUTION AGREEMENT

QuickLinks - Click here to rapidly navigate through this document Exhibit 10.29 ALTIGEN COMMUNICATIONS INC. DISTRIBUTION AGREEMENT THIS DISTRIBUTION AGREEMENT ("Agreement") is made and entered into as of this 30 day of September, 2007 (the "Effective Date") by and between ALTIGEN COMMUNICATIONS INC., a Delaware corporation, with principal offices at 4555 Fremont Blvd., Fremont, CA 94538 ("AltiGen"

November 20, 2007 EX-99.1

ALTIGEN ANNOUNCES STOCK REPURCHASE PROGRAM

Contacts: Phil McDermott Jason Golz, Quynh Nguyen CFO Investor Relations AltiGen Communications Financial Dynamics 510-252-9712 415-439-4532 pmcdermott@altigen.

November 20, 2007 8-K

Other Events, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) November 19, 2007 AltiGen Communications, Inc. (Exact name of Registrant as specified in charter) Delaware 000-27427 94-3204299 (State or other jurisdiction of incorporation) (Commissi

September 17, 2007 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) September 17, 2007 AltiGen Communications, Inc. (Exact name of Registrant as specified in charter) Delaware 000-27427 94-3204299 (State or other jurisdiction of incorporation) (Commiss

August 20, 2007 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) August 20, 2007 AltiGen Communications, Inc. (Exact name of Registrant as specified in charter) Delaware 000-27427 94-3204299 (State or other jurisdiction of incorporation) (Commission

August 20, 2007 EX-99.1

Contacts: Phil McDermott Christiane Pelz CFO Investor Relations AltiGen Communications Lippert/Heilshorn & Associates 510-252-9712 415-433-3777 [email protected] [email protected] ALTIGEN REPORTS PERMISSION FOR TWO-MEMBER AUDIT COMMITTEE

Contacts: Phil McDermott Christiane Pelz CFO Investor Relations AltiGen Communications Lippert/Heilshorn & Associates 510-252-9712 415-433-3777 pmcdermott@altigen.

August 13, 2007 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2007 OR o TRANSITION REPORT PURSUANT T

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2007 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-27427 ALTIGEN COMMUNICATIONS

July 25, 2007 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) July 19, 2007 AltiGen Communications, Inc. (Exact name of Registrant as specified in charter) Delaware 000-27427 94-3204299 (State or other jurisdiction of incorporation) (Commission F

July 25, 2007 EX-99.1

EX-99.1

Contacts: Phil McDermott Christiane Pelz CFO Investor Relations AltiGen Communications Lippert/Heilshorn & Associates 510-252-9712 415-433-3777 pmcdermott@altigen.

July 25, 2007 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): July 25, 2007 ALTIGEN COMMUNICATI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): July 25, 2007 ALTIGEN COMMUNICATIONS, INC. (Exact name of Registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 000-27427 (Commission File Nu

May 11, 2007 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ý QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2007 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-27427 ALTIGEN COMMUNICATION

April 25, 2007 EX-99.1

ALTIGEN COMMUNICATIONS POSTS SECOND QUARTER FISCAL 2007 RESULTS

Contacts: Phil McDermott Brendan Lahiff CFO Investor Relations AltiGen Communications Financial Dynamics 510-252-9712 415-439-4504 pmcdermott@altigen.

April 25, 2007 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): April 25, 2007 ALTIGEN COMMUNICAT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): April 25, 2007 ALTIGEN COMMUNICATIONS, INC. (Exact name of Registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 000-27427 (Commission File N

April 6, 2007 EX-99.1

AltiGen Communications Appoints Jeremiah Fleming as President & Chief Operating Officer

AltiGen Communications Appoints Jeremiah Fleming as President & Chief Operating Officer Fremont, California, April 3, 2007 — AltiGen® Communications, Inc.

April 6, 2007 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) April 2, 2007 AltiGen Communications, Inc. (Exact name of Registrant as specified in charter) Delaware 000-27427 94-3204299 (State or other jurisdiction of incorporation) (Commission F

February 14, 2007 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED DECEMBER 31, 2006 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-27427 ALTIGEN COMMUNICAT

February 9, 2007 SC 13G

OMB APPROVAL

Schedule 13G Page 1 of 4 SEC 1745 (6-00) Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.

January 29, 2007 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) January 23, 2007 ALTIGEN COMMUNICATIONS, INC. (Exact name of Registrant as specified in charter) Delaware 000-27427 94-3204299 (State or other jurisdiction of incorporation) (Commissio

January 29, 2007 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registran

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) x Defin

January 24, 2007 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 January 24, 2007 Date of Report (Date of Earliest Event Reported) AltiGen Communica

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 January 24, 2007 Date of Report (Date of Earliest Event Reported) AltiGen Communications, Inc. (Exact name of Registrant as specified in its charter) Delaware 000-27427 94-3204299 (State or other Jurisdiction of Incorporation) (Commi

January 24, 2007 EX-99.1

Contacts: Phil McDermott Jason Golz CFO Investor Relations AltiGen Communications Financial Dynamics 510-252-9712 415-439-4532 [email protected] [email protected] ALTIGEN COMMUNICATIONS POSTS FIRST QUARTER FISCAL 2007 RESULTS ~ Company achieves

Contacts: Phil McDermott Jason Golz CFO Investor Relations AltiGen Communications Financial Dynamics 510-252-9712 415-439-4532 pmcdermott@altigen.

December 29, 2006 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended September 30, 2006 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-27427 ALTIGEN COMM

November 15, 2006 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 November 15, 2006 Date of Report (Date of Earliest Event Reported) AltiGen Communic

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 November 15, 2006 Date of Report (Date of Earliest Event Reported) AltiGen Communications, Inc. (Exact name of Registrant as specified in its charter) Delaware 000-27427 94-3204299 (State or other Jurisdiction of Incorporation) (Comm

November 15, 2006 EX-99.1

ALTIGEN COMMUNICATIONS POSTS FOURTH QUARTER AND YEAR-END FISCAL 2006 RESULTS

Contacts: Phil McDermott Jason Golz, Brendan Lahiff CFO Investor Relations AltiGen Communications Financial Dynamics 510-252-9712 415-439-4532 pmcdermott@altigen.

August 14, 2006 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ý QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2006 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-27427 ALTIGEN COMMUNICATIONS

July 26, 2006 EX-99.1

ALTIGEN COMMUNICATIONS POSTS RECORD RESULTS FOR THIRD QUARTER OF FISCAL 2006

Contacts: Phil McDermott Jason Golz, Quynh Nguyen CFO Investor Relations AltiGen Communications Financial Dynamics 510-252-9712 415-439-4532 pmcdermott@altigen.

July 26, 2006 8-K

Results of Operations and Financial Condition, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 July 26, 2006 Date of Report (Date of Earliest Event Reported) AltiGen Communications, Inc. (Exact name of Registrant as specified in its charter) Delaware 000-27427 94-3204299 (State or other Jurisdiction of Incorporation) (Commissi

July 5, 2006 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) June 28, 2006 AltiGen Communications, Inc. (Exact name of Registrant as specified in charter) Delaware 000-27427 94-3204299 (State or other jurisdiction of incorporation) (Commission F

July 5, 2006 EX-16.1

July 5, 2006

Exhibit 16.1 July 5, 2006 Securities and Exchange Commission 100 F Street, N.E. Washington, D.C. 20549-7561 Dear Sirs/Madams: We have read Item 4.01 of the AltiGen Communications, Inc. Form 8-K dated June 28, 2006, and have the following comments: 1. We agree with the statements made in the first sentence of the first paragraph and in the second, third, and fourth paragraphs. 2. We have no basis o

May 15, 2006 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2006 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-27427 ALTIGEN COMMUNICATION

April 28, 2006 8-K

Results of Operations and Financial Condition, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 April 26, 2006 Date of Report (Date of Earliest Event Reported) AltiGen Communications, Inc. (Exact name of Registrant as specified in its charter) Delaware 000-27427 94-3204299 (State or other Jurisdiction of Incorporation) (Commiss

April 28, 2006 EX-99.1

ALTIGEN COMMUNICATIONS Second Quarter 2006 Earnings April 26, 2006 4:00 pm CT

ALTIGEN COMMUNICATIONS Second Quarter 2006 Earnings Moderator: Jason Golz 04-26-06/4:00 pm CT Page 1 ALTIGEN COMMUNICATIONS Second Quarter 2006 Earnings April 26, 2006 4:00 pm CT Conference Coordinator: We appreciate your patience and please continue to stand by.

February 21, 2006 10-Q/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q/A ý QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED DECEMBER 31, 2005 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-27427 ALTIGEN COMMUNIC

February 17, 2006 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED DECEMBER 31, 2005 o TRANSITION REPORT PURSUANT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED DECEMBER 31, 2005 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-27427 ALTIGEN COMMUNICAT

January 3, 2006 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registran

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) x Defin

December 28, 2005 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended September 30, 2005 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-27427 ALTIGEN COMM

August 15, 2005 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

10-Q 1 v02358710-q.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ý QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2005 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number: 000-2742

May 13, 2005 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

Unassociated Document UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.

February 11, 2005 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED DECEMBER 31, 2004 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-27427 ALTIGEN COMMUNICAT

January 26, 2005 EX-99.1

AltiGen Posts Record Revenues for Fiscal First Quarter 2005 Revenue Increases 18% Over Same Period in 2004

Exhibit 99.1 AltiGen Posts Record Revenues for Fiscal First Quarter 2005 Revenue Increases 18% Over Same Period in 2004 FREMONT, Calif., Jan. 26 /PRNewswire-FirstCall/ - AltiGen Communications, Inc. (Nasdaq: ATGN), a leading provider of next generation IP-PBX phone systems today reported its financial results for the Company’s first quarter of fiscal 2005, ended December 31, 2004. Revenues for the

January 26, 2005 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 26, 2005 AltiGen Communications, Inc. (Exact name of registrant as specified in its charter) Delaware 000-27427 94-3204299 (State or other jurisdiction (Commission (IRS Employ

January 6, 2005 DEF 14A

SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement

SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

December 30, 2004 S-8

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Unassociated Document As filed with the Securities and Exchange Commission on December 30, 2004 Registration No.

December 29, 2004 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

QuickLinks - Click here to rapidly navigate through this document UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

August 17, 2004 10-Q

FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) X QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended JUNE 30, 2004 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 000-27427 ALTIGEN COMM

June 30, 2004 S-8

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-8 REGISTRATION STATEMENT Under The Securities Act of 1933 ALTIGEN COMMUNICATIONS, INC. (Exact name of Registrant as specified in its charter)

EDGARized at Vintage Filings, LLC As filed with the Securities and Exchange Commission on June 30, 2004 Registration No.

May 17, 2004 10-Q

SIGNATURE

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q | X | QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2004 | | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 0-27427 ALTIGEN COMMUNICATIO

May 17, 2004 EX-3.2

EX-3.2

Exhibit 3.2 SECOND AMENDED AND RESTATED BYLAWS OF ALTIGEN COMMUNICATIONS, INC. (a Delaware corporation) TABLE OF CONTENTS (CONTINUED) TABLE OF CONTENTS PAGE - ARTICLE I CORPORATE OFFICES...................................................1 1.1 REGISTERED OFFICE...........................................1 1.2 OTHER OFFICES...............................................1 ARTICLE II MEETINGS OF STOCKH

February 19, 2004 SC 13G

Signature

UNITED STATES OMB APPROVAL SECURITIES AND EXCHANGE COMMISSION OMB Number: 3235-0145 Washington, D.

February 19, 2004 SC 13G

Signature

UNITED STATES OMB APPROVAL SECURITIES AND EXCHANGE COMMISSION OMB Number: 3235-0145 Washington, D.

February 19, 2004 SC 13G

Signature

UNITED STATES OMB APPROVAL SECURITIES AND EXCHANGE COMMISSION OMB Number: 3235-0145 Washington, D.

February 17, 2004 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ý QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED DECEMBER 31, 2003 o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 0-27427 ALTIGEN COMMUNICATIONS,

January 9, 2004 DEF 14A

SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

QuickLinks - Click here to rapidly navigate through this document SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

December 29, 2003 EX-10.4

ALTIGEN COMMUNICATIONS, INC. 1999 STOCK PLAN (AS AMENDED ON JUNE 2, 1999 AND AUGUST 15, 2002)

EX-10.4 3 a2124860zex-104.htm EX-10.4 QuickLinks - Click here to rapidly navigate through this document Exhibit 10.4 ALTIGEN COMMUNICATIONS, INC. 1999 STOCK PLAN (AS AMENDED ON JUNE 2, 1999 AND AUGUST 15, 2002) 1. Purposes of the Plan. The purposes of this 1999 Stock Plan are: • to attract and retain the best available personnel for positions of substantial responsibility, • to provide additional

December 29, 2003 EX-10.27

ALTIGEN COMMUNICATIONS INC. DISTRIBUTION AGREEMENT

EX-10.27 5 a2124860zex-1027.htm EXHIBIT 10.27 QuickLinks - Click here to rapidly navigate through this document Exhibit 10.27 ALTIGEN COMMUNICATIONS INC. DISTRIBUTION AGREEMENT THIS DISTRIBUTION AGREEMENT ("Agreement") is made and entered into as of this 22nd day of December, 1999, (the "Effective Date") by and between ALTIGEN COMMUNICATIONS INC., a California corporation, with principal offices a

December 29, 2003 EX-10.28

DISTRIBUTOR AGREEMENT

EX-10.28 6 a2124860zex-1028.htm EXHIBIT 10.28 QuickLinks - Click here to rapidly navigate through this document Exhibit 10.28 DISTRIBUTOR AGREEMENT AGREEMENT made as of the 12 day of June, 2003, by and between AltiGen Communications, Inc., a corporation duly organized and existing under the laws of the State of Delaware, with its principal office at 47427 Fremont Blvd., Fremont, California 94538,

December 29, 2003 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

QuickLinks - Click here to rapidly navigate through this document UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

December 29, 2003 EX-10.8

INDUSTRIAL LEASE AGREEMENT Landlord: VEF III FUNDING, LLC, a Delaware limited liability company Tenant: ALTIGEN COMMUNICATIONS, INC., a Delaware corporation Dated: October 1, 2003 For Premises Located At: 4555 CUSHING PARKWAY FREMONT, CALIFORNIA TABL

EX-10.8 4 a2124860zex-108.htm EX-10.8 QuickLinks - Click here to rapidly navigate through this document Exhibit 10.8 INDUSTRIAL LEASE AGREEMENT Between Landlord: VEF III FUNDING, LLC, a Delaware limited liability company And Tenant: ALTIGEN COMMUNICATIONS, INC., a Delaware corporation Dated: October 1, 2003 For Premises Located At: 4555 CUSHING PARKWAY FREMONT, CALIFORNIA TABLE OF CONTENTS LEASE A

August 8, 2003 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

10-Q 1 d10q.htm FORM 10-Q Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2003 ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission Fil

May 14, 2003 EX-99.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

EX-99.1 3 dex991.htm CERTIFICATION OF CHIEF EXECUTIVE OFFICER Exhibit 99.1 CERTIFICATION OF CHIEF EXECUTIVE OFFICER PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 I, Gilbert Hu, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report of AltiGen Communicatio

May 14, 2003 EX-99.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

EX-99.2 4 dex992.htm CERTIFICATION OF CHIEF FINANCIAL OFFICER Exhibit 99.2 CERTIFICATION OF CHIEF FINANCIAL OFFICER PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 I, Philip M. McDermott, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report of AltiGen Com

May 14, 2003 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2003 ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-27427 ALTIGE

April 2, 2003 EX-99.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Certification of Chief Executive Officer Exhibit 99.1 CERTIFICATION OF CHIEF EXECUTIVE OFFICER PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 I, Gilbert Hu, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report of AltiGen Communications, Inc. on Form 10-Q

April 2, 2003 EX-99.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Certification of Chief Financial Officer Exhibit 99.2 CERTIFICATION OF CHIEF FINANCIAL OFFICER PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 I, Philip M. McDermott, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report of AltiGen Communications, Inc. on

April 2, 2003 10-Q/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q/A

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q/A x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED DECEMBER 31, 2002 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-2742

February 19, 2003 SC 13G

OMB APPROVAL

Schedule 13G Page 1 of 5 SEC 1745 (02-02) Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.

February 19, 2003 SC 13G/A

OMB APPROVAL

Schedule 13G Page 1 of 5 SEC 1745 (02-02) Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.

February 19, 2003 SC 13G/A

OMB APPROVAL

Amendment No. 1 to SC 13G Schedule 13G Page 1 of 6 SEC 1745 (02-02) Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number. OMB APPROVAL OMB Number: 3235-0145 Expires: December 31, 2005 Estimated average burden hours per response . . . . . . 11 UNITED STATES SECURITIES AN

January 6, 2003 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant ¨

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) x Definitive

December 30, 2002 EX-10.5

EX-10.5

Exhibit 10.5 ALTIGEN COMMUNICATIONS, INC. 1999 EMPLOYEE STOCK PURCHASE PLAN (AS AMENDED AUGUST 15, 2002 AND NOVEMBER 11, 2002) The following constitute the provisions of the 1999 Employee Stock Purchase Plan of AltiGen Communications, Inc. 1. Purpose. The purpose of the Plan is to provide employees of the Company and its Designated Subsidiaries with an opportunity to purchase Common Stock of the C

December 30, 2002 EX-3.2

EX-3.2

Exhibit 3.2 SECOND AMENDED AND RESTATED BYLAWS OF ALTIGEN COMMUNICATIONS, INC. (a Delaware corporation) TABLE OF CONTENTS Page ARTICLE I CORPORATE OFFICES ................................................. 1 1.1 REGISTERED OFFICE ................................................. 1 1.2 OTHER OFFICES ..................................................... 1 ARTICLE II MEETINGS OF STOCKHOLDERS .........

December 30, 2002 EX-10.24

EX-10.24

Exhibit 10.24 PROMISSORY NOTE SECURED BY DEED OF TRUST $1,000,000 January , 2001 , California FOR VALUE RECEIVED, the undersigned, GILBERT C.P. HU ("Employee") and MAY K.R. HU, husband and wife (jointly and severally, "Borrowers"), promise to pay to the order of ALTIGEN COMMUNICATIONS, INC., a Delaware corporation ("Lender"), at 47427 Fremont Boulevard, Fremont, California 94538 (or at such other

December 30, 2002 EX-99.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Certification of Chief Financial Officer Exhibit 99.2 CERTIFICATION OF CHIEF FINANCIAL OFFICER PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 I, Philip McDermott, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Annual Report of AltiGen Communications, Inc. on Form 1

December 30, 2002 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) x Report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended September 30, 2002 OR ¨ Transition Report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File Number 000-27427 ALT

December 30, 2002 EX-10.4

EX-10.4

Exhibit 10.4 ALTIGEN COMMUNICATIONS, INC. 1999 STOCK PLAN (AS AMENDED ON JUNE 2, 1999 AND AUGUST 15, 2002) 1. Purposes of the Plan. The purposes of this 1999 Stock Plan are: o to attract and retain the best available personnel for positions of substantial responsibility, o to provide additional incentive to Employees, Directors and Consultants, and o to promote the success of the Company's busines

December 30, 2002 EX-99.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Certification of Chief Executive Officer Exhibit 99.1 CERTIFICATION OF CHIEF EXECUTIVE OFFICER PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 I, Gilbert Hu, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Annual Report of AltiGen Communications, Inc. on Form 10-K fo

December 30, 2002 EX-10.25

EX-10.25

Exhibit 10.25 FIRST AMENDED PROMISSORY NOTE $800,000.00 September 17, 2001 Fremont, California FOR VALUED RECEIVED, the undersigned, GILBERT C.P. HU (the "Employee") and MAY K.R. HU (jointly and severally, the "Borrowers"), promise to pay to ALTIGEN COMMUNICATIONS, INC., a Delaware corporation ("Lender"), at 47427 Fremont Boulevard, Fremont, California, 94538 (or at such other place as Lender may

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