Tekelec Extends Relationship with T-Mobile to the United Kingdom

Tekelec Wins Third Order to Upgrade T-Mobile Signaling Network to
IP
MORRISVILLE, N.C.--(Business Wire)--
Tekelec (NASDAQ: TKLC) has recently won an order to upgrade the
T-Mobile UK signaling network. The deployment delivers IP-based
signaling into the network to ensure the smooth transition to an
all-IP network.

This is the third order T-Mobile has signed with Tekelec in Europe
over the past year, and follows the successful roll-out of Tekelec's
SIGTRAN --Internet protocol (IP)-based Signaling System 7 (SS7)
solution, running on the EAGLE Signaling Solution platform at T-Mobile
Germany and T-Mobile Netherlands.

"Tekelec addressed our requirements efficiently and
cost-effectively while at the same time ensuring our network is
future-proof," said David James, head of network planning and
development, T-Mobile UK. "We have selected Tekelec for their superior
solution, their strong local presence, and their successful
implementation of this technology with other mobile operators in the
UK and abroad."

The deployment helps maximize the efficiency of T-Mobile UK's
existing network resources, enables the migration of subscribers to
new technologies and provides additional security and screening
functions. The deployment also supports the smooth introduction of
roaming services and provides interoperability between networks with
disparate technologies.

Introducing SIGTRAN into the signaling network is the "stepping
stone" for migrating to Session Initiation Protocol (SIP) signaling in
an IP Multimedia Subsystem (IMS) architecture. The introduction of
standards-based SIGTRAN, which is fully compatible with the existing
SS7 signaling network, increases signaling capacity at a lower cost.
The underlying IP infrastructure can be leveraged for the parallel
evolution from SS7 to SIP--as SIP signaling is able to traverse over
the same quality of service-enabled IP network.

"Tekelec technology is now deployed in two of the four tier-one
mobile networks in the UK, a testament to our commitment to delivering
innovative, reliable, high-quality signaling solutions for today and
for the future," said Wolrad Claudy, Tekelec's managing director for
Europe, Africa, Asia and Australia. "We're privileged to be working
with such a progressive company as T-Mobile as they evolve their
networks to accommodate growth and offer new services. This roll-out
places us at the heart of their signaling network and further enhances
our international relationship."

About T-Mobile UK

T-Mobile is one of the world's largest mobile operators with more
than 119 million customers worldwide and in the UK it is the network
of choice for 17.3 million customers, making it one of the largest
networks. T-Mobile has a range of innovative products and services
such as Flext, a unique tariff with flexible pricing; U-Fix, a tariff
that combines pay-as-you-go and a monthly contract and web'n'walk,
which enables customers to surf websites on the move. T-Mobile's
network coverage is among the best in the UK (over 99 per cent of the
UK population) with one of the lowest dropped call rates. It offers
the largest worldwide Wi-Fi network, with more than 1,000 HotSpots in
business-friendly locations in the UK and 21,000 worldwide, and offers
the fastest HSDPA network across the UK with speeds of up to 1.8mb per
second.

For more information about T-Mobile UK, please visit
www.t-mobile.co.uk

About Tekelec

Tekelec leverages its global leadership in core multimedia session
control and network intelligence to ensure scalable, secure and highly
available communications. The company's leading signaling solutions
enable the interworking of different network applications,
technologies and protocols, providing a smooth transition to
next-generation networks. Corporate headquarters are located near
Research Triangle Park in Morrisville, N.C., U.S.A., with research and
development facilities and sales offices throughout the world. For
more information, please visit www.tekelec.com.

Tekelec Public Relations Contact:
Joanne Latham
Director, Corporate Marketing
919-653-9655
joanne.latham@tekelec.com
or
Tekelec Investor Contacts:
Jim Chiafery
Director, Investor Relations
919-461-6825
jim.chiafery@tekelec.com

Copyright Business Wire 2008