Carriers and Network Equipment Vendors Leverage Spirent Test Systems for Next Generation Network Deployments.

New Features on Spirent Landslide, Spirent Protocol Tester and Spirent Abacus 5000 Simplify Delivery of Converged Network Services

SUNNYVALE, Calif. -- Spirent Communications plc (LSE: SPT), a global provider of performance analysis and service management solutions, today announced several new enhancements to its portfolio of next generation network testing solutions that ease deployments of converged networks and services. These include Packet Data Gateway (PDG) testing on Spirent Landslide and Bearer Independent Call Control (BICC) protocol testing on Spirent Abacus 5000. These new features will be highlighted at Fall VON 2007 in Spirent's Hospitality Suite # 157 A.

Competition and consolidation is forcing service providers and network equipment vendors to expedite the deployment of successful next generation networking technologies, such as IMS and WiMAX, while ensuring the highest quality of service and subscriber experience. The new features introduced on Spirent Landslide, Spirent Protocol Tester and Spirent Abacus 5000 enables the industry to overcome the complexities of testing these converged technologies.

"Next-generation network architectures allows users to easily move between networks be they wireless or wireline. However, with this ease of use, come numerous technical challenges," said Andy Huckridge, director of Next Generation Networks (NGN) solutions marketing at Spirent Communications. "Spirent's NGN test solutions are specifically designed for multi-protocol and multi-application test cases, to ensure faster test cycle times and reduce product development time."

Today's consumers demand access to interactive content at anytime, from anywhere and from any device - be it a computer, television set or a PDA. Ensuring subscribers have access to the services they paid for and at the quality level they expect is critical for next generation network service providers. Validating the performance of the PDG, which is the entrance point to the mobile core, is essential to successful service delivery. With the Spirent Landslide PDG testing option, carriers can test for performance and accuracy of secure access to the 3GPP packet data core via the PDG. Performance testing can be done in the lab, prior to deployment so as to avoid any surprises when new services and applications are rolled out. Spirent Landslide also allows modeling of the customer experience for secure transmissions.

To deliver interactive content and applications, service providers have to migrate from circuit-switched TDM networks to high-capacity broadband multimedia networks. A smooth transition is only possible with the accurate performance testing of the BICC protocol by equipment vendors and carriers. Spirent is introducing BICC protocol testing on the Spirent Abacus 5000, which allows customers to simulate mobile voice traffic to VoIP and PSTN all within a single test environment.

Spirent has also introduced several other capabilities to its NGN testing portfolio including IMS AKA/IPSec testing and enhanced support for XML, SIP, XCAP and Diameter testing on the award winning Spirent Protocol Tester; IMS Security, PDIF, CDMA Convergence, and PCRF testing on Landslide; and AMW-WB (G.722.2) voice codec testing on Abacus 5000.

Spirent Protocol Tester has received numerous awards including IMS Magazines 2007 IMS Leadership Award, Test & Measurement Worlds' "Best-in-Test" Award and Internet Telephony's 2006 Product of the Year Award.

About Spirent Communications plc

Spirent Communications (www.spirentcom.com) is a global provider of integrated performance analysis and service assurance systems that enable the development and deployment of next-generation networking technology such as Internet telephony, broadband services, 3G wireless, global navigation satellite systems, and network security equipment. Spirent Communications' solutions are used by more than 1,700 customers in 30 countries, including the world's largest equipment manufacturers, service providers, enterprises and governments. Based in Sunnyvale, CA, Spirent Communications has 1,500 employees worldwide.

Spirent Communications plc Ordinary shares are traded on the London Stock Exchange (ticker: SPT). The Company operates a Level 1 American Depositary Receipt ("ADR") programme with each ADR representing four Spirent Communications plc Ordinary shares. The ADRs trade in the US over-the-counter ("OTC") market under the symbol SPMYY and the CUSIP number is 84856M209. Spirent Communications' sales to the United States government are made through Spirent Federal Systems Inc. www.spirentfederal.com

Spirent, Spirent Communications and the Spirent logo are trademarks or registered trademarks of Spirent Communications plc. All other trademarks or registered trademarks mentioned herein are held by their respective companies. All rights reserved.

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