Acme Packet Enhances Network for Charter Telephone(TM).

Acme Packet Net-Net Session Border Controllers (SBCs) Deliver IP Interactive Communication Services for 3rd Largest U.S. Cable Company

BURLINGTON, Mass. -- Acme Packet[R] (NASDAQ: APKT), the leader in session border control solutions, today announced that Charter Communications, Inc., (NASDAQ:CHTR) a leading broadband communications company, is utilizing Acme Packet's Net-Net[R] session border controllers (SBCs) in its Charter Telephone[TM] VoIP network. The Net-Net product family enables Charter to connect to application service providers (ASPs) to offer innovative IP interactive communication services while protecting its network and providing critical control functions for these services. With this announcement, Acme Packet now supports trusted, first class VoIP services for seven of the top ten MSOs in North America.

"Charter continually seeks out means to provide new and innovative services to our telephone customers," said Armando Ruiz, Senior Director, Engineering-Telephone for Charter Communications. "We look for products, like Acme Packet Net-Net SBCs, that give us a critical advantage as we expand our services, both in terms of offerings as well as geography."

"Charter clearly understands that new revenue and cost savings opportunities can be realized with our Net-Net SBCs," explained Seamus Hourihan, Acme Packet's vice president of marketing and product management. "With years of experience serving our cable customers, Acme Packet is uniquely positioned to assist innovative companies like Charter to address the challenges associated with the deployment of real-time interactive IP-based voice, video and multimedia sessions in cable broadband networks."

Acme Packet Net-Net SBCs combine purpose-built hardware with high-quality session border control features that together deliver carrier-class scalability, performance and reliability. Supporting multiple protocols and multiple applications, the Net-Net SBCs provide critical control functions at both access and interconnect borders, satisfying new requirements in five major areas: security, service reach maximization, SLA assurance, revenue and profit protection and regulatory compliance. The Net-SAFE[R] security features, including access control lists, call rate limiting and topology hiding, help ensure that IP networks are secure and available to provide IP interactive communication services. The Net-Net SBCs also perform ENUM queries, enabling optimized and cost-effective call routing.

About Acme Packet

Acme Packet, the leader in session border control solutions, enables service providers to deliver trusted, first class interactive communications--voice, video and multimedia sessions--across IP network borders. Our Net-Net family has been selected by over 325 service providers in nearly 70 countries, including 22 of the top 25 wireline and wireless providers in the world, to satisfy critical security, service assurance and regulatory requirements in wireline, cable and wireless networks. These deployments support multiple applications--from VoIP trunking to hosted enterprise and residential services; multiple protocols--SIP, H.323, MGCP/NCS and H.248; and multiple border points--interconnect, access network and data center. For more information, contact us at +1 781.328.4400, or visit www.acmepacket.com.

About Charter Communications

Charter Communications, Inc. is a leading broadband communications company and the third-largest publicly traded cable operator in the United States. Charter provides a full range of advanced broadband services, including advanced Charter Digital(R) video entertainment programming, Charter High-Speed[TM] Internet access service, and Charter Telephone[TM] services. Charter Business[TM] similarly provides scalable, tailored and cost-effective broadband communications solutions to business organizations, such as business-to-business Internet access, data networking, video and music entertainment services and business telephone. Charter's advertising sales and production services are sold under the Charter Media(R) brand. More information about Charter can be found at www.charter.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, our expected financial and operating results, our ability to build and grow Acme Packet, the benefits of our product, and our ability to achieve our goals, plans and objectives. 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.