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

                                  June 8, 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 File Number)    (IRS Employer
  of Incorporation)                                       Identification No.)

                250 APOLLO DRIVE, CHELMSFORD, MASSACHUSETTS 01824
               (Address of Principal Executive Offices) (Zip Code)

                                 (978) 614-8100

              (Registrant's telephone number, including area code)


Check  the  appropriate  box  below  if the  Form  8-K  filing  is  intended  to
simultaneously  satisfy the filing obligation of the registrant under any of the
following provisions (see General Instruction A.2. below):

|_|  Written  communications  pursuant to Rule 425 under the  Securities Act (17
     CFR 230.425)

|_|  Soliciting  material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
     240.14a-12)

|_|  Pre-commencement   communications  pursuant  to  Rule  14d-2(b)  under  the
     Exchange Act (17 CFR 240.14d-2(b))

|_|  Pre-commencement   communications  pursuant  to  Rule  13e-4(c)  under  the
     Exchange Act (17 CFR 240.13e-4(c))





Item 8.01. Other Events.

     On June 8, 2005, Sonus Networks,  Inc. issued a press release reporting the
termination of an SEC investigation.  A copy of the press release is attached as
Exhibit 99.1 hereto.





                                    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: June 8, 2005                        SONUS NETWORKS, INC.

                                          By: /s/ Ellen Richstone
                                             -------------------------
                                               Ellen Richstone
                                               Chief Financial Officer





                                  Exhibit Index

99.1      Press release of Sonus Networks, Inc. dated June 8, 2005 reporting the
          termination of an SEC investigation.