<PAGE>

--------------------------------------------------------------------------------
                            FORM 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): June 20, 2002

                          ALTIGEN COMMUNICATIONS, INC.
             (Exact name of registrant as specified in its charter)

                                    DELAWARE
                 (State or other jurisdiction of incorporation)

             000-27427                                    94-3204299
       (Commission File Number)                (IRS Employer Identification No.)

      47427 Fremont Boulevard, Fremont, CA                   94538
    (Address of principal executive offices)               (Zip code)

       Registrant's telephone number, including area code: (510) 252-9712

                                       N/A
          (Former name or former address, if changed since last report)

<PAGE>

Item 4. Changes in Registrant's Certifying Accountant.

On June 20, 2002, the Audit Committee of AltiGen Communications, Inc.'s (the
"Company") Board of Directors approved a change in the Company's independent
public accountants for the fiscal year ended September 30, 2002, from Arthur
Andersen LLP to Deloitte & Touche LLP. The report of Arthur Andersen LLP for the
fiscal years ended September 30, 2000 and 2001 contained no adverse opinions,
disclaimer of opinion or qualification or modification as to uncertainty, audit
scope or accounting principles. During the fiscal years ended September 30, 2000
and 2001, and the interim period from October 1, 2001 through June 20, 2002,
there were no disagreements between the Company and Arthur Andersen LLP on any
accounting principles or practices, financial statement disclosure or auditing
scope or procedure, which, if not resolved to the satisfaction of Arthur
Andersen LLP, would have caused it to make reference to the subject matter of
the disagreement in connection with its report. No event described in paragraph
(a) (1) (v) of Item 304 of Regulation S-K has occurred within the Company's
fiscal years ending September 2000 and 2001, or the period from October 1, 2001
through June 20, 2002.

The Company has provided Arthur Andersen LLP with a copy of the foregoing
disclosures and has requested a letter from them stating whether Arthur Andersen
LLP agrees with the disclosures contained in this report. The Company expects to
file this letter with the Commission within ten (10) business days of the date
of this report.

The Company did not consult with Deloitte & Touche LLP during the fiscal years
ended September 2000 and 2001, and the interim period from October 1, 2001
through June 20, 2002, with respect to the application of accounting principles
to a specified transaction, either completed or proposed, or the type of audit
opinion that might be rendered on the Company's financial statements, or any
other matters or reportable events listed in paragraphs (a)(2)(i) and (ii) of
Item 304 of Regulation S-K.

Item 7. Financial Statements and Exhibits.

    (a) Financial statements and pro forma financial information

    NONE

    (b) Exhibits

    NONE

<PAGE>

                                    SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                             ALTIGEN COMMUNICATIONS, INC.

                                             By:    /s/ Philip McDermott
                                                 -------------------------------
                                                    Philip McDermott
                                                    Chief Financial Officer

Date:  June 26, 2002
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--------------------------------------------------------------------------------
                            FORM 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): June 20, 2002

                          ALTIGEN COMMUNICATIONS, INC.
             (Exact name of registrant as specified in its charter)

                                    DELAWARE
                 (State or other jurisdiction of incorporation)

             000-27427                                    94-3204299
       (Commission File Number)                (IRS Employer Identification No.)

      47427 Fremont Boulevard, Fremont, CA                   94538
    (Address of principal executive offices)               (Zip code)

       Registrant's telephone number, including area code: (510) 252-9712

                                       N/A
          (Former name or former address, if changed since last report)
Item 4. Changes in Registrant's Certifying Accountant.

On June 20, 2002, the Audit Committee of AltiGen Communications, Inc.'s (the
"Company") Board of Directors approved a change in the Company's independent
public accountants for the fiscal year ended September 30, 2002, from Arthur
Andersen LLP to Deloitte & Touche LLP. The report of Arthur Andersen LLP for the
fiscal years ended September 30, 2000 and 2001 contained no adverse opinions,
disclaimer of opinion or qualification or modification as to uncertainty, audit
scope or accounting principles. During the fiscal years ended September 30, 2000
and 2001, and the interim period from October 1, 2001 through June 20, 2002,
there were no disagreements between the Company and Arthur Andersen LLP on any
accounting principles or practices, financial statement disclosure or auditing
scope or procedure, which, if not resolved to the satisfaction of Arthur
Andersen LLP, would have caused it to make reference to the subject matter of
the disagreement in connection with its report. No event described in paragraph
(a) (1) (v) of Item 304 of Regulation S-K has occurred within the Company's
fiscal years ending September 2000 and 2001, or the period from October 1, 2001
through June 20, 2002.

The Company has provided Arthur Andersen LLP with a copy of the foregoing
disclosures and has requested a letter from them stating whether Arthur Andersen
LLP agrees with the disclosures contained in this report. The Company expects to
file this letter with the Commission within ten (10) business days of the date
of this report.

The Company did not consult with Deloitte & Touche LLP during the fiscal years
ended September 2000 and 2001, and the interim period from October 1, 2001
through June 20, 2002, with respect to the application of accounting principles
to a specified transaction, either completed or proposed, or the type of audit
opinion that might be rendered on the Company's financial statements, or any
other matters or reportable events listed in paragraphs (a)(2)(i) and (ii) of
Item 304 of Regulation S-K.

Item 7. Financial Statements and Exhibits.

    (a) Financial statements and pro forma financial information

    NONE

    (b) Exhibits

    NONE
SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                             ALTIGEN COMMUNICATIONS, INC.

                                             By:    /s/ Philip McDermott
                                                 -------------------------------
                                                    Philip McDermott
                                                    Chief Financial Officer

Date:  June 26, 2002