Acme Packet remains undisputed leader in session border controller market 

Infonetics shows Acme Packet market share at more than three times the closest competitor

BURLINGTON, MA, APRIL 14, 2009 — Acme Packet® (NASDAQ: APKT), the leader in session border control solutions, today announced that leading research firms, Infonetics and Current Analysis, reported that Acme Packet continued its commanding lead in the session border controller (SBC) market in 2008. In recent reports, both firms showed Acme Packet as the leading SBC vendor with around half of the total market.

In their March 2009 report, Service Provider VoIP Equipment and Subscribers – Quarterly Worldwide Market Share and Forecasts 4Q08, Infonetics reported that Acme Packet captured 48% of the SBC market based on product revenues in Q4 2008.  For the fiscal year 2008, Infonetics showed Acme Packet with 45% market share, more than three times that of any competitor. Current Analysis’ January 2009 Company Assessment gave Acme Packet a five star rating while noting the company’s “consistent technological innovation and customer traction” as the driving force behind the rating. The same report noted Synergy Research Group’s evaluation of Acme Packet as holding more than a 30% market share advantage (51.9% of the overall market) over the number two player in the standalone SBC market in the first nine months of 2008.

“As Tier 1 service providers continue their IP network transformation to replace their existing voice networks, SBCs are an integral component of their replacement program,” said Diane Myers, directing analyst of service provider VoIP and IMS at Infonetics Research. “Acme Packet is capitalizing on that transformation and has found success with a broad set of NGN applications including IMS and fixed mobile convergence.”

“These market share numbers demonstrate that Acme Packet’s growth is based on the strong foundation of our technology and our broad-reaching base of over 635 customers across fixed and wireless service providers, enterprise and contact center market segments,” said Andy Ory, president, CEO and co-founder of Acme Packet. “Acme Packet’s Net-Net SBCs provide a real value to our customers and help them solve the critical security issues they face in smartly simplifying the delivery of next generation network services across IP network borders.”

About Acme Packet
Acme Packet, Inc. (NASDAQ: APKT), the leader in session border control solutions, enables the delivery of trusted, first-class interactive communications—voice, video and multimedia sessions—and data services across IP network borders. Our Net-Net family of session border controllers, multiservice security gateways and session routing proxies supports multiple applications in service provider, large enterprise and contact center networks—from VoIP trunking to hosted enterprise and residential services to fixed-mobile convergence. They satisfy critical security, service assurance and regulatory requirements in wireline, cable and wireless networks; and support multiple protocols—SIP, H.323, MGCP/NCS and H.248—and multiple border points—interconnect, access and data center. Our products have been selected by more than 635 customers in 92 countries, including 29 of the top 30, and 89 of the top 100 service providers in the world. For more information, contact us at +1 781.328.4400, or visit www.acmepacket.com.

Acme Packet Safe Harbor Statement
Statements contained herein that are not historical fact may be forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. Such forward-looking statements may relate, among other things, to our position in the session border control market and IMS projects around the world,  our ability to build and grow Acme Packet, Acme Packet’s flexibility should IMS elements be changed or additional endpoints added, the benefits and advantages of our products, including any enhancements or new features, new services, IMS capability and new programs. Such forward-looking statements do not constitute guarantees of future performance and are subject to a variety of risks and uncertainties that could cause our actual results to differ materially from those anticipated. These include, but are not limited to: difficulties in growing our customer base, difficulties leveraging market opportunities, difficulties providing solutions that meet the needs of customers, poor product sales, long sales cycles, difficulty developing new products, difficulty in relationships with vendors and partners, higher risk in international operations, difficulty managing rapid growth, and increased competition. Additional factors that could cause actual results to differ materially form those projected or suggested in any forward-looking statements are contained in our recent filings with the Securities and Exchange Commission, including those factors discussed under the caption “Risk Factors” in such filings.