Tatara Systems and Airvana Partner to Demonstrate SIP-Based CDMA Femtocell at CTIA Wireless 2009

Airvana`s HubBub CDMA Femtocell and Tatara`s Convergence Server Demonstrate Live
SIP-based Femtocell Traffic
ACTON, Mass.--(Business Wire)--
Tatara Systems, the leader in SIP-based femtocell convergence, today announced
that it will be demonstrating its SIP-based femtocell convergence solution with
Airvana in Tatara`s booth (8951 in Central Hall 4) during CTIA Wireless 2009,
April 1-3, 2009 at the Las Vegas Convention Center in Las Vegas, NV. The
demonstration will utilize the Tatara Convergence Server (TCS), the industry`s
first SIP-based application server to focus on an all-IP approach to femtocell
integration and the Airvana HubBub CDMA femtocell.

Femtocells have the potential to extend the reach of a mobile operator`s network
into homes, and enterprises, positively impacting the customer experience for
millions of subscribers by enhancing coverage, and providing capacity for
bandwidth hungry applications. Tatara has staked out an early leadership
position in this market, as the first vendor to deliver a SIP-based solution for
femtocell network integration. Likewise, Airvana pioneered the use of SIP/IMS
technology in CDMA2000 femtocells. As noted by most industry analysts, IP-based
femtocell deployment is the only method that offloads the legacy mobile core
infrastructure, thereby providing the capacity needed for 3G service delivery
and enabling operators to recognize substantial cost savings through OPEX and
CAPEX optimization.

The Tatara Convergence Server (TCS) solution enables the interconnection of
femtocells and other advanced technology IP-based radio network elements with
the legacy macro network, providing the full mobile voice, messaging and data
experience in an IP environment supporting both VoIP and IMS networks. The TCS
capabilities include authentication of the mobile subscribers, handoff between
femtocells and the macro network, emergency and supplementary services, as well
as delivering new IP-based applications to existing mobile handsets without
modifying or disrupting the macro network. The TCS is available in a CDMA or
GSM/UMTS variant.

"Our HubBub CDMA is the only femtocell in the market to support both 1xRTT voice
and EV-DO mobile broadband data" said Sanjeev Verma, vice president of femtocell
business and co-founder of Airvana. "Combined in the network with the Tatara
Convergence Server, we are delivering the full range of mobile services with
vastly improved performance for users indoors."

"As the recognized leader in SIP-based femtocell convergence, we are pleased to
once again demonstrate our innovation and strong partnerships within the
femtocell industry," stated Marc Cremer, executive vice president of operations
for Tatara Systems. "We are thrilled to be collaborating with Airvana on this
SIP-based solution that provides ease of deployment for operators and the
ability to drive more services. As the femtocell market continues to evolve, so
has the overall awareness of the substantial benefits and R.O.I. that a
SIP-based femtocell convergence solution provides. Current pressures from the
challenging economic environment coupled with growing capacity demands for
bandwidth intensive applications, have compelled operators to seek alternatives
to incurring either additional strain on or costly investments in their legacy
mobile infrastructure."

About Airvana:

Airvana helps operators transform the mobile experience for users worldwide. The
company`s high-performance technology and products, from comprehensive femtocell
solutions to core mobile network infrastructure, enable operators to deliver
compelling and consistent broadband services to mobile subscribers, wherever
they are. Airvana`s products are deployed in 70 commercial networks on all six
continents. The company is headquartered in Chelmsford, Mass., USA, with offices
worldwide. For more information, please visit www.airvana.com.

About Tatara Systems:

Tatara Systems is the world leader in SIP-based femtocell convergence,
supporting both IMS and pre-IMS standards based architectures. Tatara`s
cost-effective, highly scalable and future-proof approach to femtocell
deployment provides seamless integration with the legacy network plus enables
operators to deliver next-generation residential and business services without
re-engineering the incumbent mobile core. The Tatara Convergence Server solution
provides service interworking; delivers unified voice, messaging and data
services; and provides uniform calling and feature plans across diverse
networks. Tatara is working with its customers and partners to speed the
deployment of femtocells worldwide. For more information, visit
www.tatarasystems.com.

Airvana:
Davies Murphy Group
Rob Morton, +1 781-418-2460
rmorton@daviesmurphy.com
or
Tatara Systems:
Kelly Friedland, +1 978-206-0831
kfriedland@tatarasystems.com

Copyright Business Wire 2009