Tekelec Launches SIP Educational Webinar Series

Tekelec (NASDAQ: TKLC) today announced it had launched a four-part Session Initiation Protocol (SIP) educational webinar series, with one session planned for each quarter in 2008. With the acquisitions of iptelorg, a developer of leading-edge SIP routing software, and Estacado Systems, a software development company instrumental in the creation of SIP, along with continuing traction for its NGN products, Tekelec is well positioned to help telecom operators transition to SIP and IP-based networks. The first in the series of SIP educational webinars took place on March 18, 2008, and was led by Jiri Kuthan, assistant vice president for SIP services and a renowned SIP expert. Kuthan, who joined Tekelec with the iptelorg acquisition, offered a brief overview on the history of SIP, including definitions, standards and use cases on voice, messaging, presence and conferencing. The event was very well received. Highlights include: Over 1,100 registrants and more than 500 attendees, about half of whom were employees of Telecom Operators A global audience representing all regions, with about half the attendees from North America "It was a unique experience for me because it is rare in my region to get such a valuable session online that is relevant for a global audience,” said Asif Iqbal, Senior Manager Operations Core Networks for Mobilink, a leading cellular service provider in Pakistan. "The content was clear and informative, the use cases were relevant, and overall, the session provided a great overview to SIP. I look forward to future SIP webinars from Tekelec.” The second webinar of the series is scheduled to take place on Tuesday, June 3rd, 2008, and will focus on SIP protocol, procedures, and architecture. This session will be led by Robert Sparks, who joined Tekelec from Estacado Systems. Sparks coordinates the industry's premier interoperability event, the SIPit. He also chairs the IETF's SIMPLE working group, which defines extensions to SIP for Presence and Instant Messaging. He was a contributing editor to RFC 3261, which defines the SIP protocol, and the author of several updates to the core protocol and its extensions, including RFCs 3515 and 3892, which extend SIP to allow a rich set of call transfer capabilities. Sparks is also a member of the board of directors of the SIP Forum. The remaining SIP educational webinars will discuss SIP deployment, SIP security and services, and will take place during the third and fourth quarters, respectively. The exact dates will be announced on our website www.tekelec.com. To pre-register for the second seminar, please click here. A recorded version of the first SIP webinar can be found here. 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. FORWARD-LOOKING STATEMENTS Certain statements made in this press release are forward looking, reflect the Company's current intent, belief or expectations and involve certain risks and uncertainties. The Company's actual future performance may not meet the Company's expectations. As discussed in the Company's Annual Report on Form 10-K for 2007 (the "2007 Form 10-K”) and its other filings with the Securities and Exchange Commission (the "Commission”), the Company's future operating results are difficult to predict and subject to significant fluctuations. Factors that may cause future results to differ materially from the Company's current expectations, in addition to those identified in the Company’s 2007 Form 10-K and its other filings with the Commission, include, among others, changes in the market price of the Company’s common stock and changes in the Company’s financial results, financial condition and cash requirements. The Company undertakes no obligation to publicly update any forward-looking statements whether as a result of new information, future events or otherwise.