Cohen Milstein Sellers & Toll PLLC Announces Investigation of Sonus Networks, Inc.

WASHINGTON–(BUSINESS WIRE)–Cohen Milstein Sellers & Toll PLLC is conducting an investigation to
determine whether Sonus Networks, Inc. (“Sonus” or the “Company”) and
certain of its officers and directors made false and misleading
statements and/or omissions in violation of Sections 10(b) and 20(a) of
the Securities Exchange Act of 1934.

A class action lawsuit was filed in the U.S. District Court for the
District of Massachusetts by another law firm on behalf of purchasers of
the common stock of Sonus Networks, Inc. (NASDAQ: SONS) between January
8, 2015 and March 24, 2015, inclusive (the “Class Period”).

The complaint alleges that Sonus and certain of its officers and
directors (“Defendants”) made false and misleading statements and/or
failed to disclose that there was no reasonable basis for Sonus’s first
quarter 2015 revenue guidance.

On March 24, 2015, Sonus issued a press release announcing that the
Company expected only $47 to $50 million in revenue in the first quarter
2015, far short of a previously projected $74 million. Sonus noted that
it initiated a “Company-wide review of its cost structure” and would
terminate a significant number of employees. With respect to the revenue
shortfall, Sonus stated: “the Company no longer expects to receive
certain orders this quarter that had been expected to be received at the
back end of the first quarter.” The price of Sonus shares fell from
$13.16 on March 23, 2015 to $8.70 on March 24, 2015.

After the end of the Class Period, on August 7, 2018, the SEC issued a
press release and order charging Sonus (now Ribbon Communications Inc.),
and certain officers with making material misstatements on January 8,
2015 and February 18, 2015 concerning Sonus’s first quarter 2015 revenue
guidance and estimates. The SEC documents outlined Sonus’s inflation of
projected revenue by including deals that were not expected to close
during the quarter. The SEC Order mandated that the Company cease and
desist from violations and imposed a fine on the Company and certain
officers.

Cohen Milstein encourages all investors who purchased Sonus common stock
between January 8, 2015 and March 24, 2015, inclusive, or former
employees with information concerning this matter to contact the firm.

If you are a Sonus shareholder and would like to discuss your right to
recover for your economic loss, you may, without any cost or obligation,
call Cohen Milstein’s Managing Partner, Steven
J. Toll
at (888) 240-0775 or (202) 408-4600, or email him at stoll@cohenmilstein.com.
If you wish to serve as lead plaintiff, you must move the Court no later
than January 7, 2019 to request appointment. Any member of the proposed
class may retain Cohen Milstein or other attorneys to serve as your
counsel in this action, or you may do nothing and remain an absent class
member.

Cohen Milstein has significant experience in prosecuting investor class
actions and actions involving securities fraud, and is active in major
litigation pending in federal and state courts throughout the nation.
Cohen Milstein has taken a lead role in numerous important cases on
behalf of defrauded investors, and has been responsible for a number of
outstanding recoveries which, in the aggregate, total billions of
dollars. Prior results do not guarantee a similar outcome. For more
information visit www.cohenmilstein.com.

If you have any questions about this notice or the action, or with
regard to your rights, please contact either of the following:

Steven
J. Toll, Esq.

Marie Mullins
Cohen Milstein Sellers & Toll
PLLC
1100 New York Avenue, N.W.
Fifth Floor
Washington,
D.C. 20005
Telephone: (888) 240-0775 or (202) 408-4600
Email: stoll@cohenmilstein.com;
mmullins@cohenmilstein.com

Attorney Advertising

Contacts

Steven
J. Toll, Esq.

Marie Mullins
Cohen Milstein Sellers & Toll
PLLC
1100 New York Avenue, N.W.
Fifth Floor
Washington,
D.C. 20005
Telephone: (888) 240-0775 or (202) 408-4600
Email: stoll@cohenmilstein.com;
mmullins@cohenmilstein.com

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