Telefónica O2 Germany Selects Acme Packet to Deliver IMS-based Residential VoIP Services

Acme Packet Net-Net Session Border Controllers Secure Service, Maximize Service
Reach and Assure SLAs For Retail and Wholesale Customers

BURLINGTON, Mass.--(Business Wire)--
Acme Packet, Inc. (NASDAQ: APKT), the leader in session border control
solutions, today announced that Telefónica O2 Germany has selected Acme Packet`s
session border controllers (SBCs) to provide key IP Multimedia Subsystem (IMS)
functionality at its access and interconnect borders. The Acme Packet Net-Net
Session Director (SD) enables Telefónica O2 Germany to deploy a secure and
interoperable IMS network supporting residential retail and wholesale VoIP
services and IP interconnects with other service providers.

Directly, and through its wholesale partners, Telefónica O2 Germany currently
provides fixed telephony and DSL services to approximately 1.4 million
customers. The Net-Net SBCs are part of an IMS next-generation network that will
replace an older VoIP platform and enable Telefónica O2 Germany to offer VoIP
services to its residential customers and wholesale hosted residential VoIP
services-Telefónica Voice4Carrier and Telefónica Voice4SIPOwner-to other service
providers. Telefónica O2 Germany also uses the Net-Net SBCs to securely
interconnect with other tier 1 service providers for off-net call origination
and termination.

Telefónica O2 Germany selected Acme Packet`s Net-Net 4500 SD to meet critical
3GPP IMS functional requirements at the access and interconnect borders of its
network. At the subscriber access border, the Net-Net 4500 SD integrates the
Proxy-Call Session Control Function (P-CSCF), the initial SIP signaling contact
point for subscriber endpoints, and the Access Gateway Function (AGW) for
controlling subscriber media flows. At the interconnect border to other service
provider networks, the Net-Net 4500 SD integrates the Interconnect Border
Control Function (I-BCF), the SIP signaling point for sessions leaving or coming
into the network, and the Transition Gateway (TrGW) for controlling associated
media flows. Both the access and interconnect SBCs include a Signaling Firewall,
a vital function that protects the SBC itself and core IMS service elements,
which is missing from the IMS architecture.

Net-SAFE, Acme Packet`s security framework, provides denial of service (DoS)
attack prevention, topology hiding and access control to protect Telefónica O2
Germany`s IMS network and ensure service availability. In addition, the Net-Net
4500 SD also provides multiple encryption capabilities, including IPsec using
IMS-AKA and Transport Layer Security (TLS), for secured sessions between
subscriber endpoints and Telefónica O2 Germany`s IMS services network. Acme
Packet SBCs maximize the service reach of Telefónica O2 Germany using hosted NAT
traversal, SIP signaling normalization as well as interworking between its
next-generation IMS and older VoIP platforms. Telefónica O2 Germany uses Acme
Packet`s flexible session admission control policies to prevent core network
overloads and assure customer SLAs. To help ensure regulatory compliance, the
Net-Net SD provides signaling and media replication for lawful intercept and a
location server interface to obtain and append location information for
emergency calls.

"Acme Packet`s market-leading SBCs, combined with the company`s experience in
delivering essential IMS functionality, made them the best choice for us,"
commented Karsten Schroeder for Telefónica O2 Germany. "Acme Packet is an
integral part of our next-generation network migration, providing the necessary
tools to roll out flexible, reliable and scalable IMS-based services to our
residential retail and wholesale customers."

"Acme Packet is helping service providers around the world solve critical
challenges in delivering seamless, high-quality, interactive communication
services with IMS networks," said Seamus Hourihan, vice president of marketing
and product management for Acme Packet. "With Acme Packet session border
controllers, Telefónica O2 Germany is able to protect its IMS network while
maximizing its service reach and quality for its 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 675 customers in 95 countries. They include 29 of the
top 30, and 89 of the top 100 service providers in the world, and 6 of the
Fortune 25. For more information, contact us at +1 781.328.4400, or visit
www.acmepacket.com.

About Telefónica O2 Germany GmbH & Co. OHG

Telefónica O2 Germany GmbH & Co. OHG belongs to Telefónica Europe and is part of
the Spanish telecommunication group Telefónica S.A. The Company offers its
German private and business customers postpaid and prepaid mobile telecom
products as well as innovative mobile data services based on the GPRS and UMTS
technologies. In addition, the integrated communications provider also offers
DSL fixed network telephony and high-speed internet. Telefónica Europe has more
than 47 million mobile and fixed network customers in Great Britain, Ireland,
the Czech Republic, Slovakia and Germany.

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
establish and maintain intellectual property rights, our ability to build and
grow Acme Packet, the benefits and advantages of our products, including the
ability to maximize service reach and quality for customers and any enhancements
or new features, services and programs, 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, difficulties
in integrating an acquired business, 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.

Media Contact:
Connect2 Communications
Elizabeth Starr Miller, 847-223-2653
elizabeth@connect2comm.com
or
Investor Relations:
Acme Packet
Brian Norris, 781-328-4790
bnorris@acmepacket.com

Copyright Business Wire 2009