Here's one of those announcements that always makes me wish I could be a fly on the wall in the incumbent provide's conference room. Don't you really want to know who the incumbent was who couldn't hang on to the account. Congrats to Sonus on continuing their well-deserved success.

TORTEL COMMUNICATIONS SELECTS SONUS
NETWORKS TO REPLACE LEGACY IP- NETWORK

Superior
Transcoding Capabilities Help Reinvent Business Enterprise
Services

WESTFORD, Mass.,
May 29, 2008 - Sonus Networks, Inc. (Nasdaq:
SONS), a market leader in IP
communications infrastructure, today announced that Tortel Communications Inc.,
a leading provider of pure IP-telephony solutions with a strong presence in the
United States, Canada, India and Asia, has selected Sonus to replace its
incumbent IP-voice network technology.

Tortel is replacing its legacy solution to improve the
overall quality of service and integrity of its network. The Company also
required a robust, next-generation solution to enable it to develop and deliver
differentiating product offerings and an improved long distance offering. Due to
the simplified network management and efficient transcoding capabilities of
Sonus' gateway solution, Tortel expects a substantial increase in its network
performance and the ability to devote additional resources to the development of
new services.

"We conducted a thorough review of
competitive solutions before selecting Sonus Networks to serve as the
cornerstone of our enhanced next-generation long distance voice network," said
Dominic Ogbonna, Chief Technology Officer for Tortel Communications. "Sonus was
the only vendor able to provide a solution that met our requirements for
security, scalability, reliability and management. In addition, by partnering
with Sonus, we saw the opportunity to deliver operational savings and build new
revenue streams through service creation."

Tortel will utilize
Sonus' Network Border Switch (NBS), built on the market-leading GSX9000
platform, which offers carrier class IP-peering and a strong layer of security.
Tortel will take advantage of the peering and advanced transcoding capabilities
that Sonus allows to be built directly into the gateway, streamlining the
switching of traffic between IP-networks and simplifying network
management

"Tortel is emerging as one of Canada's leading suppliers of pure
IP-telephony and has shown considerable innovation in developing its networks to
enhance customer experience," said Hassan Ahmed, president, chairman and CEO,
Sonus Networks. "Whether wireline or
wireless, we are supporting forward thinking companies like Tortel in their
ambitions to generate new services for their customers and differentiate their
offerings with market leading IP-services."

About Sonus
Networks

Sonus Networks, Inc. is a leading
provider of IP-voice 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 Westford, Massachusetts. Additional information on Sonus
is available at http://www.sonusnet.com.