Chief Telecom Powers IMS in Taiwan with Acme Packet.

Asian Service Provider Offers Business-Critical Enterprise Telephony Services with Acme Packet Session Border Controllers

BURLINGTON, Mass. -- Acme Packet[R] (NASDAQ: APKT), the leader in session border control solutions, today announced that Chief Telecom, a subsidiary of Chunghwa Telecom (NYSE:CHT), the largest service provider of integrated wired and wireless communications in Taiwan, has deployed the Acme Packet Net-Net[R] session border controllers (SBCs) to offer advanced, IP Multimedia Subsystem (IMS) based enterprise VoIP services throughout the island.

Chief Telecom has deployed Acme Packet's Net-Net SBCs for their IMS-based, enterprise solution, which includes SIP trunking, IP-Centrex, audio conferencing, video telephony, voice mail and messaging services. Acme Packet's SBCs also secure and connect Chief Telecom's Microsoft MSN VoIP service for consumers with its international peering network. Chief's Telecom's parent company, CHT, has used Acme Packet's SBCs for more than four years as part of its IMS-based, fixed-line residential and mobile VoIP, and international SIP peering services.

The Acme Packet Net-Net SBCs session admission control functions allow Chief Telecom to provide high-quality VoIP and interactive multimedia services with assured SLAs for its business customers and service provider peering partners. Acme Packet's SIPconnect Compliant[R] Net-Net SBCs also enable interoperability with IMS core infrastructure equipment and a wide array of IP-enabled customer-premise devices, enabling Chief Telecom to easily accommodate its business customers' disparate IP telephony infrastructure and changes within its own network. Acme Packet's SBCs also provide redundancy for Chief Telecom's IMS service infrastructure with load balancing, routing and disaster recovery features. In addition, Acme Packet's Net-SAFE[R] capabilities secure Chief Telecom's IMS service elements by performing access control, topology hiding and denial of service (DoS/DDoS) protection from malicious attacks and non-malicious overloads.

"Acme Packet's Net-Net SBCs are key elements in ensuring our network's security and quality of service," said the Senior Director of the Telecommunications Service Department, Enterprise VoIP Solution, for Chief Telecom. "In addition to providing ease of interoperability with many other IP-PBX vendors' equipment, Acme Packet's SBCs also provide comprehensive security and control features to our enterprise customers."

"Chief Telecom is delivering innovative, telecommunication services to over 20 million customers in Taiwan, including business-critical applications and services to complex enterprise environments," said Seamus Hourihan, vice president of product management and marketing for Acme Packet. "Acme Packet's SBCs play a pivotal role in helping solve the challenges that Chief Telecom faces in delivering high-quality, IMS-based, IP communication services to both its enterprise and residential customers."

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, 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, H.248 and RTSP--and multiple border points--service provider access and interconnect, and enterprise access and trunking. Our products have been selected by more than 830 customers in 95 countries. They include 48 of the top 50, and 89 of the top 100 service providers in the world; and 8 of the Fortune 25. For more information, contact us at +1 781.328.4400, or visit www.acmepacket.com.

About Chunghwa Telecom Inc.

Chunghwa Telecom Co., Ltd. (NYSE:CHT) is a telecommunications service provider in Taiwan. As an integrated telecommunications service provider, its principal services include fixed-line services, including local, domestic long distance and international long-distance telephone services, cellular services, and Internet and data services, including HiNet, its Internet service provider, Fiber to the X (FTTx) services, asymmetrical digital subscriber line (ADSL) services and leased-line services. To learn more about CHT and Chief Telecom, please visit www.cht.com.tw and www.chief.com.tw.

Acme Packet, Inc. 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, the benefits and features of sessions border controllers, the ability to facilitate service and support and to secure large enterprise networks, as well as Acme Packet's expected range and reach into new markets and its relationships with new customers, distributions channel and product partners. Such forward-looking statements do not constitute guarantees of future performance and are subject to a variety of risks and uncertainties that could cause actual results to differ materially from those anticipated. These include, but are not limited to: difficulties expanding its 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; difficulty managing its financial performance; its ability to hire and retain employees and appropriately staff its operations; its cash needs; the impact of new accounting pronouncements and increased competition. Additional factors that could cause actual results to differ materially from those projected or suggested in any forward-looking statements are contained in the Company's recent filings with the Securities and Exchange Commission, including those factors discussed under the caption "Risk Factors" in such filings.