Tekelec Teams with Siemens to Deploy optiPoint Family of SIP Phones wi

    Business Editors/High-Tech Editors

    MORRISVILLE, N.C.--(BUSINESS WIRE)--March 9, 2005--Tekelec (NASDAQ: TKLC), a leading developer of telecommunications products for next-generation fixed, mobile and packet networks, today announced plans to incorporate the Siemens optiPoint family of Session Initiation Protocol (SIP) phones into its expanding portfolio of next-generation telephony offerings.
    Initial deployments of the Siemens optiPoint(TM) 410 and 420 SIP phone families are planned at TeleSpectrum, a Tekelec customer, in 2005. TeleSpectrum, a part of Telecommunicatie B.V., is a reseller of telecom and data solutions based in the Netherlands. With the combined Tekelec 6000 VoIP Applications Server and the Siemens optiPoint family of SIP phones, TeleSpectrum will benefit from a comprehensive suite of voice over IP (VoIP) telephony features, applications and phones.
    "Tekelec has created significant traction among operators with its comprehensive endpoint portfolio and interoperability initiatives," said Mark Straton, senior vice president of marketing for Siemens Communications, Inc. "Siemens will continue to work with TeleSpectrum and Tekelec to deliver standards-based SIP phones, with flexible features and options designed to maximize user efficiency and to help organizations reduce the costs of moves, additions and changes. Our next generation of VoIP devices, networks and presence-enhanced applications are all designed to create barrier-free communications no matter where people work, live or travel."
    Patrick van der Spek, managing director at TeleSpectrum Managed Voice Services, added, "We chose the partnership of Tekelec and Siemens because of the advanced hosted IP telephony solutions Tekelec offers, which are unique in the Netherlands. Siemens is well known for its excellent network of innovative products, services and solutions."
    Tekelec is the only IP telephony application developer to support the four industry-standard IP phone protocol--SIP, media gateway control protocol (MGCP), signaling connection control part (SCCP) and MiNet. It now supports 40 different integrated access devices and IP phone models, as well as the largest number of deployed SIP end-points in a managed network, thus continuing its leadership in supporting a wider variety of endpoints than any other hosted IP telephony application developer.
    Tricia Hosek, president and general manager of the Tekelec Switching Solutions Group, added, "The Siemens optiPoint family of IP phones offers unrivaled adaptability and portability across platforms for businesses looking to build a solid, future-proof communications foundation. The optiPoint IP phones further enable Tekelec to provide customers with a comprehensive suite of IP phone capabilities to meet any end-user's needs."

    About Siemens

    Siemens AG (NYSE:SI) is one of the largest global electronics and engineering companies with reported worldwide sales of $91.5 billion in fiscal 2004. Founded more than 150 years ago, the company is a leader in the areas of Medical, Power, Automation and Control, Transportation, Information and Communications, Lighting, Building Technologies, Water Technologies and Services and Home Appliances. With its U.S. corporate headquarters in New York City, Siemens in the USA has sales of $16.6 billion and employs 70,000 people throughout all 50 states and Puerto Rico. Eleven of Siemens' worldwide businesses are based in the United States. With its global headquarters in Munich, Siemens AG and its subsidiaries employ 430,000 people in 192 countries. For more information on Siemens in the United States: www.usa.siemens.com.

    About Siemens Communications Group

    Siemens Communications, Inc., offers its customers a broad portfolio of communication products and services and is a leader in converged technologies, products and services for wireless, fixed and enterprise networks. The company's portfolio ranges from devices for end users to complex network infrastructures and complementary services for enterprises, carriers and service providers. Siemens Communications, Inc., is headquartered in Boca Raton, Fla. For more information, visit www.usa.siemens.com/communications.

    About TeleSpectrum Managed Voice Services

    TeleSpectrum Managed Voice Services is part of TeleSpectrum Telecommunicatie B.V., reseller of telecom and data solutions. TeleSpectrum has become one of the leading organizations in the telecom and ICT branch in the Netherlands. TeleSpectrum delivers a wide range of services, from basic communication needs to turn-key solutions for Customer Contact Centers, CTI, voice over Internet Protocol (VoIP), Unified Messaging and intelligent data networks. TeleSpectrum Managed Voice Services has the know-how to provide every organization with decent advice regarding the present or future situation of the telecom and data environment.

    About Tekelec

    Tekelec is a leading developer of now and next-generation signaling and switching telecommunications solutions, network performance management technology and value-added applications. Tekelec's innovative solutions are widely deployed in traditional and next-generation wireline and wireless networks and contact centers worldwide. Corporate headquarters are located in Calabasas, Calif., with research and development facilities and sales offices throughout the world.

    The Tekelec logo, EAGLE, G-Flex, G-Port, and IP7 are registered trademarks of Tekelec. Sentinel, TekServer, and TekWare are trademarks of Tekelec. All other trademarks are the property of their respective owners.

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CONTACT: Tekelec Director, Investor Relations: Mike Attar, 818-880-7821 michael.attar@tekelec.com Manager, Public Relations: Joni King Brooks, 919-461-1065 joni.brooks@tekelec.com or GolinHarris Laura Slagle, 972-308-9141 Mobile: 214-566-7845 lslagle@golinharris.com

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