Willcom of Japan Selects Starent Networks' Multimedia Core Solution for Next Generation PHS Network

Business Wire, June 9, 2008

TEWKSBURY, Mass. -- Starent Networks, Corp. (Nasdaq: STAR), a leading provider of infrastructure solutions that enable mobile operators to deliver multimedia services, today announced Willcom, Inc., a mobile data telecommunications provider in Japan, has selected Starent Networks' ST40 multimedia core platform solution for its Next Generation - Personal Handyphone System (XG-PHS) to provide multimedia services to subscribers.

Willcom announced plans to start XG-PHS service in 2009. This network will provide subscribers high-speed internet access on their mobile network. Willcom will use Starent Networks' multi-access, multi-service ST40 multimedia core platform with PHS Access Gateway and Home Agent functionality.

Willcom said they selected the Starent Networks solution based on its ability to integrate multiple network functions and services in a single platform, its successful interoperability with a wide range of radio network infrastructure elements, and its proven demonstration of ASN Gateway and Home Agent capabilities.

"Working with an operator like Willcom that seeks to offer innovative solutions to their market, is a tremendous advantage to Starent Networks as we continue to enhance our offerings," said Ashraf Dahod, CEO of Starent Networks. "Willcom's deployment of our access gateway and home agent in their PHS network further demonstrates the flexibility, power and intelligence of our multimedia solutions. We are appreciative of the opportunity."

Starent Networks' multimedia core platform solutions combine subscriber and network intelligence with powerful performance to address the needs of large, high-demand, multimedia deployments. Starent Networks' solutions deliver the high capacity, high availability and high performance required by today's multimedia broadband networks and are readily upgradeable to respond to evolving 4G radio networks. Through system intelligence Starent Networks' platform can perform a detailed inspection of each subscriber session, shaping and managing the session based on subscriber, application or business policies. Starent Networks' multimedia solutions utilize deep packet inspection (DPI) technology, service steering and intelligent traffic control to deliver this intelligence on a per-subscriber basis.

About Willcom, Inc.

WILLCOM, Inc. is a leading mobile data telecommunications company, providing PHS services in Japan. In addition to data telecommunications, WILLCOM introduced the "WILLCOM Flat-Rate Plan" in May 2005, the industry's first fixed-rate voice communication service. WILLCOM has also introduced a series of other new services to the market, and currently has more than 4.60 million cumulative subscribers (as of April 2008). For more information (available in English and Japanese), visit WILLCOM's website at http://www.willcom-inc.com.

About Starent Networks, Corp.

Starent Networks, Corp. is a leading provider of infrastructure solutions that enable mobile operators to deliver multimedia services to their subscribers. Starent Networks has created solutions that provide mobile operators with the functions and services needed for access, mobility management and call control in their networks. Through integrated intelligence and high performance capabilities, Starent Networks' solutions also enhance subscriber management, billing and session policy enforcement. The company's products are capable of supporting a wide range of mobile wireless networks, such as UMTS, CDMA2000, WiFi, and WiMAX. Starent Networks' products have been deployed by over 65 mobile operators in 25 countries. Additional information about Starent Networks is available at www.starentnetworks.com.

Starent Networks' Safe Harbor Statement

Any statements in this press release about future expectations, plans and prospects for Starent Networks, including statements about expectations related to the company's multimedia solutions constitute forward-looking statements within the meaning of The Private Securities Litigation Reform Act of 1995. These statements contain the words "believes," "anticipates," "plans," "expects," "will" and similar expressions. Actual results may differ materially from those indicated by such forward-looking statements as a result of various important factors, including the inability to predict the future success or market acceptance of Starent Networks' multimedia solutions, the highly competitive and rapidly evolving market in which Starent Networks' competes, Starent Networks' limited operating history, the fluctuation of its past operating results, its reliance on a limited number of customers for a significant portion of its revenues and its reliance on a single line of products and other factors discussed in the "Risk Factors" section in Starent Networks' most recent Annual Report on Form 10-Q filed with the Securities and Exchange Commission. In addition, the forward-looking statements included in this press release represent Starent Networks' views as of the date of this press release. Starent Networks anticipates that subsequent events and developments will cause its views to change. However, while Starent Networks may elect to update these forward-looking statements at some point in the future, it specifically disclaims any obligation to do so. These forward-looking statements should not be relied upon as representing Starent Networks' views as of any date subsequent to the date of this press release.