Carrier Access and Acme Packet Complete Interoperability Tests; Further Assuring Complete End-to-End Solutions for Next-Generati

Carrier Access Corporation (Nasdaq: CACSE), a leading
provider of broadband communications equipment, and Acme Packet(R),
the leader in Session Border Control (SBC), announced compatibility
between Carrier Access Adit(R) 3104 Business Gateway and the Acme
Packet Net-Net(R) session border controllers. As a result, service
providers will be able to easily deliver enhanced Voice-over-IP (VoIP)
and other real-time interactive IP-based services and applications to
business and government users.
   The Adit 3104 was tested with the Net-Net Session Director (SD) in
various real-world calling scenarios, with successful results,
achieving complete compatibility. Additionally, the companies
confirmed two mutual service provider customers are currently in
trials with the same configuration.
   "With Acme Packet's continued leadership in the SBC market, it
only made sense to continue the interoperability efforts that we began
with the Adit 600 several years ago," said Marty Hahnfeld, senior vice
president, Converged Access, Carrier Access. "Compatibility with Acme
Packet's Net-Net SD is a key step in our effort to provide our
customers with best-of-breed solutions."
   "Acme Packet's Net-Net session border controllers are
interoperating with a long and ever-expanding list of the industry's
leading IP-based products in service provider networks around the
world," noted Seamus Hourihan, vice president marketing and product
management, Acme Packet. "By supporting interoperability between
Carrier Access' Adit Business Gateway line and our session border
controllers, we provide our customers with a truly carrier-class
solution for the delivery of secure, high-quality real-time
communications across IP networks."
   Field-proven and backed by extensive interoperability
partnerships, the Carrier Access Adit line of IP access solutions are
deployed globally by service providers to meet the growing demand to
deliver converged IP services to their business customers. Powering
some of the leading IP and VoIP deployments, the Adit products'
combination of carrier-grade design, performance and security features
at disruptive price points offers unparalleled cost savings for both
business users and service providers.

   About Carrier Access

   Carrier Access (Nasdaq: CACSE) provides consolidated access
technology designed to streamline communication network operations of
service providers, enterprises and government agencies. Carrier Access
products enable customers to upgrade access capacity, and implement
converged services while lowering costs and accelerating service
revenues. Carrier Access' technologies help our customers do more with
less. For more information, visit www.carrieraccess.com.

   About Acme Packet

   Acme Packet, the leader in session border control, enables service
providers to deliver premium, interactive communications -- voice,
video and multimedia sessions -- across IP network borders. Our
Net-Net family has been selected by 9 of the top 10, and 16 of the top
25 service providers in the world to satisfy critical security,
service assurance and law enforcement requirements in wireline, cable
and wireless networks. These deployments support all applications --
from trunking to hosted enterprise and residential services; all
protocols -- SIP, H.323, MGCP/NCS and H.248; and all border points --
peering, access network and data center. For more information, contact
us at 781-328-4400, or visit www.acmepacket.com.

   Forward-Looking Statement

   This press release contains forward-looking statements which
reflect management's best judgment based on factors currently known.
However, these statements involve risks and uncertainties, including
the successful development and market acceptance of new products, the
ability to sell new products into new and existing customers, the
degree of competition in the market for such products, and other risks
detailed in our annual report on Form 10-K for the year ended December
31, 2004. Such risks and uncertainties could cause actual results to
differ materially from those in the forward-looking statements
included in this press release.