WASHINGTON, D.C. 20549


                                    FORM 8-K

                                 CURRENT REPORT

     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

                                  July 28, 2005

                Date of Report (Date of earliest event reported)


                              SONUS NETWORKS, INC.
             (Exact Name of Registrant as Specified in its Charter)

         DELAWARE                   000-30229                 04-3387074
         --------                   ---------                 ----------

(State or Other Jurisdiction       (Commission              (IRS Employer
      of Incorporation)            File Number)           Identification No.)

               (Address of Principal Executive Offices) (Zip Code)

                                 (978) 614-8100

              (Registrant's telephone number, including area code)


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Check the appropriate box below if the Form 8-K filing is intended to
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|_|  Pre-commencement communications pursuant to Rule 14d-2(b) under the
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Item 5.02(b). Departure of Directors or Principal Officers; Election of Directors; Appointment of Principal Officers. On July 28, 2005, Sonus Networks, Inc. was notified by Bradley T. Miller, Sonus' Vice President of Finance, Corporate Controller and Chief Accounting Officer (Principal Accounting Officer), that he had accepted a position as Chief Financial Officer at a public company and will be leaving Sonus effective August 12, 2005.

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. Date: August 1, 2005 SONUS NETWORKS, INC. By: /s/ Ellen Richstone ------------------------------- Ellen Richstone Chief Financial Officer