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                                  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 2, 2006
                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.)

        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))

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ITEM 2.02. RESULTS OF OPERATIONS AND FINANCIAL CONDITION.

     On November 6, 2006, Sonus Networks, Inc. (the "Registrant") issued a press
release reporting revenue results for the quarter ended September 30, 2006. A
copy of the press release is attached as Exhibit 99.1 hereto.

     The information in this Item 2.02 of this Current Report on Form 8-K and
Exhibit 99.1 attached hereto shall not be deemed "filed" for purposes of Section
18 of the Securities Exchange Act of 1934, as amended, or incorporated by
reference in any filing under the Securities Act of 1933, as amended, or the
Exchange Act, except as shall be expressly set forth by specific reference in
such a filing.

ITEM 4.02: NON-RELIANCE ON PREVIOUSLY ISSUED FINANCIAL STATEMENTS OR A RELATED
           AUDIT REPORT OR COMPLETED INTERIM REVIEW.

     As previously announced on August 7, 2006, the Registrant initiated a
voluntary review of its historical stock option grant practices with respect to
options granted following its initial public offering. The Registrant has
completed the voluntary review and, based on that review, the Registrant has
reached a preliminary conclusion that the appropriate measurement dates for
financial accounting purposes of certain stock option grants, primarily in
fiscal years 2000 to 2003, differ from the recorded grant dates of those awards.
While the Registrant's internal review of stock option practices is now
complete, the evaluation of the accounting impact resulting from the change in
measurement dates is still ongoing. The Registrant has not yet determined the
amount of the non-cash, stock-based compensation charges or related tax impacts
that will result from these changes. However, on November 2, 2006, the
Registrant's Audit Committee concluded, in consultation with the Registrant's
management and independent advisors, that the additional non-cash charges for
stock-based compensation expense will be material with respect to certain fiscal
periods and that the Registrant will therefore restate certain historical
financial statements to record the additional stock-based compensation expense,
related tax impacts and the correction of any other unrecorded adjustments
previously determined to be immaterial. The Registrant is still reviewing which
specific periods will require restatement. Accordingly, the financial
statements, related notes and selected financial data and all financial press
releases and similar communications issued by the Registrant and the related
reports of independent registered public accounting firms relating to fiscal
periods 2000 through 2005 and the first and second quarters of 2006 should no
longer be relied upon.

     The Registrant intends to amend any SEC filings as required to restate
historical annual and interim financial statements and to file its Quarterly
Reports on Form 10-Q for the quarters ended June 30, 2006 and September 30, 2006
as soon as practicable.

     The Audit Committee and management of the Registrant have discussed the
matters associated with the restatement and disclosed in this Current Report on
Form 8-K with its independent registered public accounting firms.

     On November 6, 2006, the Registrant issued a press release in connection
with the foregoing, a copy of which is attached as Exhibit 99.1 to this report
and incorporated herein by reference.

ITEM 9.01. FINANCIAL STATEMENTS AND EXHIBITS.

    (d)    Exhibits

           The following exhibit relating to Item 2.02 shall be deemed to be
           furnished, and not filed:

           99.1   Press release of Sonus Networks, Inc. dated November 6, 2006
                  reporting revenue results for the quarter ended September 30,
                  2006.

                                        2


                                    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: November 6, 2006                              SONUS NETWORKS, INC.


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

                                        3


                                  EXHIBIT INDEX

99.1   Press release of Sonus Networks, Inc. dated November 6, 2006 reporting
       revenue results for the quarter ended September 30, 2006.

                                        4
                                                                    Exhibit 99.1

           SONUS NETWORKS REPORTS 2006 THIRD QUARTER FINANCIAL RESULTS

   SONUS ACHIEVES RECORD QUARTER WITH STRONG REVENUE GROWTH; COMPANY PROVIDES
      UPDATE ON VOLUNTARY REVIEW OF HISTORICAL STOCK OPTION GRANT PRACTICES

    CHELMSFORD, Mass., Nov. 6 /PRNewswire-FirstCall/ -- Sonus Networks, Inc.
(Nasdaq: SONS), a leading supplier of service provider Voice over IP (VoIP)
infrastructure solutions, today reported its revenue results for the third
quarter ended September 30, 2006. The Company also reported that its Audit
Committee has completed the previously announced voluntary review of the
Company's practices with respect to historical employee stock option grants
since its Initial Public Offering (IPO) and, based on its preliminary evaluation
of the accounting impact of this review, the Company has determined that it will
restate its historical financial statements to make any necessary accounting
adjustments.

    Revenues for the third quarter of fiscal 2006 were $75 million. Cash,
cash equivalents and investments increased by $27 million during the third
quarter of 2006 and by $21 million year-over-year to $346 million.

    "We are very pleased with our record financial performance in the third
quarter, which reflects our market leadership with an expanding customer base,
compelling technology solutions and focused execution on meeting the growing
market for scalable and reliable IP voice solutions," said Hassan Ahmed,
chairman and CEO, Sonus Networks. "Our dynamic innovation and vision for the
future of next generation communications is advancing our leadership position in
the market. With 4 out of 5 of the world's largest network operators relying on
Sonus solutions as a foundation for their next generation voice networks and
numerous large-scale deployments underway globally, Sonus has become a
preeminent provider of field-proven, carrier-class IP voice networks in the
industry."

    Non-GAAP Financial Metrics Highlights:

    The Company is not providing detailed GAAP or non-GAAP financial results for
the quarter at this time because the Company has not yet determined the
accounting impact from its previously disclosed voluntary review of the
processes by which it has historically issued and accounted for employee stock
options. The preliminary, non-GAAP financial metrics noted below do not include
associated stock-based compensation expense or any impact that may result from
the stock option review.

    *  Nine month revenue exceeded total revenue for fiscal year 2005;
    *  Third quarter gross margins were consistent with our performance in Q2;
    *  Third quarter operating expenses decreased modestly as a percentage of
       revenue and included $2 million related to the voluntary stock option
       review;
    *  Third quarter net income increased meaningfully from the second quarter
       of 2006;
    *  Deferred revenue as of September 30, 2006 was $81 million;
    *  Finally, cash, cash equivalents, marketable securities and long-term
       investments as of September 30, 2006 were a record $346 million.

    Third Quarter Fiscal 2006 Business Highlights:

    In Q3 2006, Sonus continued to expand its presence with tier one customers
around the world. During the quarter, Sonus announced that Cingular Wireless,
the nation's largest wireless provider, expanded its Sonus-based network. In
addition, Cable and Wireless International announced a multi-country deployment
of Sonus' IP Multimedia Subsystem (IMS)-ready architecture to support a robust
next generation voice network. Sonus' success with tier one operators
underscores the scalability and reliability that are the hallmark of Sonus'
IMS-ready architecture, and the Company's ability to service and support some of
the world's largest deployments of IP-based networks.



    Sonus also significantly expanded its market footprint through a
distribution agreement with EMBARQ Logistics, Embarq's deployment, distribution
and logistics division. EMBARQ Logistics is now including Sonus' products in its
portfolio of solutions designed for the local and core IP telephony market.
Sonus also teamed with NVision Group, a market-leading Russian system
integrator, to address burgeoning market opportunities with service providers
throughout Russia and the members of the Commonwealth of Independent States
(CIS), which includes Armenia, Azerbaijan, Belarus, Georgia, Kazakhstan,
Kyrgyzstan, Moldova, Russia, Tajikistan, Ukraine, and Uzbekistan. By employing
strategic reseller agreements with leading technology partners and systems
integrators, Sonus is able to cost-effectively grow its presence in certain
segments of the market and geographies where emerging opportunities exist.

    Sonus continued to extend its legacy of innovation, introducing the latest
generation of its Network Border Switch (NBS). The new NBS was designed
specifically to provide carrier-class IP-peering and security capability to both
smaller IP-based voice networks and to less-densely populated regions of larger
IP-based networks. Unlike traditional peering and security products such as
Session Border Controllers (SBCs), Sonus' NBS delivers a unique solution that
combines session control, PSTN gateway services and security into a single, high
performance, carrier-class system. Sonus also released the latest version of its
carrier class billing platform, the Sonus Insight Management System(TM),
enabling network operators to further streamline the integration of next
generation applications with existing Operational Support Systems (OSS).

    Sonus' technology leadership and continued success with network operators
around the world earned the Company a leading market share position worldwide,
as well as in the world's most advanced markets, the United States and Japan,
according to Synergy Research Group and Infonetics Research. During the third
quarter, Sonus also surpassed several critical traffic milestones. In aggregate,
Sonus-based networks have carried more than a half trillion minutes of IP-based
voice traffic. In August 2006 alone, Sonus-based networks carried approximately
25 billion minutes of IP voice traffic, representing an approximately 75%
increase compared to August 2005. According to iLocus research, with more than a
third of all IP-based voice traffic running on Sonus-based networks, Sonus
carries approximately three times more traffic than any other vendor.

    Helping to further propel the adoption of IP-based voice technologies
throughout the industry, Sonus has continued to drive interoperability and
standards initiatives. The Sonus Open Services Partner Alliance, the industry's
largest interoperability and Session Initiation Protocol (SIP) testing
organization, added a new program to streamline the delivery of SIP-based
products and services into the rapidly evolving voice market. The Sonus
Interoperability Certification Program leverages the University of New Hampshire
Interoperability Lab (UNH-IOL) to conduct extensive testing and ensure the
seamless integration of industry-leading products with Sonus' IMS-ready
architecture.

    "Sonus' financial performance for the first nine months of 2006 demonstrates
our clear leadership position in the industry. We have outperformed the market
with impressive revenue growth and increasing customer activity, while
generating increased non-GAAP profitability for our shareholders. We believe
that the industry trends that have resulted in our strong growth this year will
continue. These market factors combined with our unique solutions and focused
execution will enable Sonus to maintain its leadership position and continue to
grow in the coming year," concluded Ahmed.

    Voluntary Stock-based Compensation Review:

    The Company today reported that its Audit Committee has completed the
previously announced voluntary review of the Company's historical stock option
grant practices with respect to options granted since its IPO. Based on that
review, the Company has reached a preliminary conclusion that the appropriate
measurement dates for financial accounting purposes of certain stock option
grants, primarily in fiscal years 2000 to 2003, differ from the recorded grant
dates of those awards. The Company also announced that the review identified no
improper conduct or violation of Company policies by any member of the Company's
current management.



    While the Company's internal review of stock option grant practices is now
complete, the evaluation of the accounting impact resulting from the change in
measurement dates for certain stock option grants is still ongoing. The Company
has not yet determined the amount of the non-cash, stock-based compensation
charges or related tax impacts that will result from these changes. However, the
Company's Audit Committee has concluded, upon consulting with management and
independent advisors, that the additional non-cash charges for stock-based
compensation expense will be material with respect to certain fiscal periods and
that the Company will therefore restate certain historical financial statements
to record the additional stock-based compensation expense, related tax impacts
and any other unrecorded adjustments previously determined to be immaterial.
The Company is still reviewing which specific periods will require restatement.

    The Company today filed a Form 8-K with the Securities and Exchange
Commission stating that the financial statements, related notes and selected
financial data and all financial press releases and similar communications
issued by the Company and the related reports of independent registered public
accounting firms relating to fiscal periods 2000 through 2005 and the first and
second quarters of 2006 should no longer be relied upon.

    NASDAQ Listing Update

    As previously announced, the Company received a NASDAQ Staff Determination
letter on August 14, 2006, indicating that the Company is not in compliance with
the NASDAQ continued listing requirements set forth in Marketplace Rule 4310(c)
(14). The Determination letter relates to the delay previously announced by the
Company in the filing of its Form 10-Q for the fiscal quarter ended June 30,
2006. On September 27, 2006, the Company appeared before the NASDAQ
Qualifications panel to present a plan for regaining compliance. The panel has
not yet rendered a decision. The Company is committed to completing the
accounting review of the changes in measurement dates as expeditiously as
possible and to prepare and file its Form 10-Qs for the second and third
quarters of 2006 and any required restated financial statements as soon as
practicable.

    Further, the Company will not complete this review in time for the Company
to file by November 9, 2006 its Form 10-Q for the quarter ended September 30,
2006. As a result, the Company intends to file a Form 12b-25 with the Securities
and Exchange Commission stating that it will be unable to file its Form 10-Q
until its review has been completed.

    As previously announced, the Company will be hosting a conference call
today, November 6, 2006, at 4:45 pm Eastern time to discuss its business
performance in the third quarter of fiscal 2006.

    Date: Monday, November 6, 2006
    Time: 4:45 pm Eastern
    To listen via telephone:
    Dial-in number: (800) 709-0219
    International Callers: (415) 537-1852

    To listen via the Internet:

    Sonus will host a live webcast of the conference call. To access the
webcast, visit http://www.sonusnet.com, Corporate, Investor Relations.

    Replay:

    A telephone playback of the call will be available following the conference
and can be accessed by calling (800) 633-8284 or for international callers,
please call (402) 977-9140. The reservation number for the replay is 21306001.
The telephone playback will be available through Monday, November 20, 2006.



    A replay of the webcast will be also available on the Sonus Networks
Investor Relations site through Tuesday, November 6, 2007. To access the replay
of the webcast, visit http://www.sonusnet.com, Corporate, Investor Relations.

    About Sonus Networks

    Sonus Networks, Inc. is a leading provider of voice over IP (VoIP)
infrastructure solutions for wireline and wireless service providers. With its
comprehensive IP Multimedia Subsystem (IMS) solution, Sonus addresses the full
range of carrier applications, including residential and business voice
services, wireless voice and multimedia, trunking and tandem switching, carrier
interconnection and enhanced services. Sonus' voice infrastructure solutions are
deployed in service provider networks worldwide. Founded in 1997, Sonus is
headquartered in Chelmsford, Massachusetts. Additional information on Sonus is
available at http://www.sonusnet.com.

    This release may contain forward-looking statements regarding future events
that involve risks and uncertainties. Readers are cautioned that these
forward-looking statements are only predictions and may differ materially from
actual future events or results. Readers are referred to Item 1A "Risk Factors"
of Sonus' Quarterly Report on Form 10-Q dated May 8, 2006, filed with the SEC,
which identifies important risk factors that could cause actual results to
differ from those contained in the forward-looking statements. Risk factors
include among others: the impact of material weaknesses in our disclosure
controls and procedures and our internal control over financial reporting on our
ability to report our financial results timely and accurately; the
unpredictability of our quarterly financial results; risks and uncertainties
associated with the Company's announced review of its historical stock option
grants and accounting, including any potential impact on the Company's financial
statements or results, any tax liabilities or penalties, the Company's inability
to timely report with the Securities and Exchange Commission, the Company's
potential inability to meet NASDAQ requirements for continued listing, potential
investigations, regulatory actions or litigation arising out of the review or
any restatement; risks associated with our international expansion and growth;
consolidation in the telecommunications industry; and potential costs resulting
from pending securities litigation against the company. Any forward-looking
statements represent Sonus' views only as of today and should not be relied upon
as representing Sonus' views as of any subsequent date. While Sonus may elect to
update forward-looking statements at some point, Sonus specifically disclaims
any obligation to do so.

    Sonus is a registered trademark of Sonus Networks, Inc. All other company
and product names may be trademarks of the respective companies with which they
are associated.

    This release includes certain non-GAAP financial results to assist investors
and analysts in assessing our periodic operating results. The non-GAAP financial
results exclude non-cash stock-based compensation expense. Non-GAAP financial
results are not a substitute for GAAP results.



    Sonus uses non-GAAP financial results internally as an alternative means for
assessing our results of operations. By excluding a non-cash charge such as
stock-based compensation, Sonus can evaluate its operations excluding this
non-cash charge and can compare its results on a more consistent basis to the
results of other companies in the industry and to its operations in prior
quarters where it did not include stock-based compensation expense under
FAS123(R) in its GAAP results. For its internal budgeting and planning, Sonus'
management uses financial statements that do not include employee stock-based
compensation. Sonus' management also uses the foregoing non-GAAP results, in
addition to the corresponding GAAP results, in determining objectives for
compensation and bonus programs or reviewing the financial performance of Sonus.
Non-GAAP financial results that exclude stock-based compensation expense also
provide useful information to investors and analysts to more readily compare the
Company's operations to prior financial results and to the financial results of
other companies in the industry who similarly exclude stock-based compensation
expense in non-GAAP results to investors and analysts. Because we have
historically reported results that exclude stock- based compensation under
FAS123(R) to the investment community, we believe the inclusion of non-GAAP
numbers provides consistency in our financial reporting. We intend to continue
to assess the potential value of reporting non-GAAP results consistent with
applicable rules and regulations.

    For more information, please contact:
    Investor Relations:            Media Relations:
    Jocelyn Philbrook              Sarah McAuley
    978-614-8672                   212-699-1836
    jphilbrook@sonusnet.com        smcauley@sonusnet.com

SOURCE  Sonus Networks, Inc.
    -0-                             11/06/2006
    /CONTACT: Investor Relations:  Jocelyn Philbrook, +1-978-614-8672,
jphilbrook@sonusnet.com, or Media Relations: Sarah McAuley, +1-212-699-1836,
smcauley@sonusnet.com, both of Sonus Networks/
    /Web site: http://www.sonusnet.com /
    (SONS)