Ellacoya Networks and Sumitomo Corporation partner in Japan
Companies finalize distribution and investment agreements; begin to power @NetHome's network

Merrimack, NH - June 25, 2003 -- Ellacoya Networks, Inc., an innovative company providing IP service control technology for broadband networks, today announced that Sumisho Electronics Co., Ltd. (Subsidiary of Sumitomo Corporation) will distribute its IP Service Control System in Japan. This follows a recent equity investment in Ellacoya by Sumitomo and its affiliate Presidio Venture Partners. Ellacoya Networks and Sumisho Electronics are currently managing deployments of the platform throughout Japan, including production deployment at @NetHome, a leading broadband operator.

"The Ellacoya 16000 platform has performed exceptionally in the @NetHome broadband network," said Mr. Sadahiko Hirose, CEO of @NetHome. "In addition to allowing us to quickly improve customer satisfaction by ensuring fairness of use on our network, the application awareness and control provided by the Ellacoya platform forms the foundation for a variety of exciting new broadband services. We expect to leverage Ellacoya's innovative product features to the embrace the trends of digital content distribution and IP-based broadcasting. We view the Ellacoya platform as a means of continually improving service quality and service offerings in our network and look forward to a system-wide deployment."

Sumisho Electronics will distribute the Ellacoya IP Service Control System, consisting of the 16000 and 4000 series switches as well as its Service Logic Software. The System provides visibility into application and subscriber usage patterns, and then allows operators to manage network resources, control network abuse, introduce flexible service plans and provide premium transport of content and services such as music, video and gaming. Sumitomo will also provide marketing resources for the System as well as first- and second-line technical support to broadband operators in Japan.

"The delivery of high value content and application services over the broadband network is becoming mainstream across Japan." said Daisuke Mikogami, President of Network Solution Unit No.2 at Sumisho Electronics, a leading IT service company in Japan. "In the intensely competitive Japanese consumer broadband market, where carriers need sources of additional revenue, the Ellacoya platform has far reaching applications. It allows us to deliver premium content in a convenient manner to the consumer, thus enabling the carrier to secure additional revenue streams. We are seeing tremendous demand for the Ellacoya IP Service Control System in Japan."

"With broadband providers in Asia reaching full market penetration, they are seeking new revenue streams which the application-awareness of Ellacoya's platform enables", said Ron Sege, president and CEO of Ellacoya Networks. "We are seeing a strong demand in these markets for our product line because of its ability to deliver new services on the broadband access network such as gaming, security, and content distribution. Increasingly, Asian carriers are adopting edge deployments where they can benefit from application and subscriber services. With a proven product and successful installations throughout North America, we are now beginning system-wide deployments in Asia, starting with Japan and Korea. We are pleased to be partnering with a world-class company like Sumitomo and appreciate the confidence demonstrated by its investment."


About Presidio Venture Partners, LLC

Presidio Venture Partners, LLC is a venture capital firm based in Silicon Valley focused on IT-related investments. Backed by Sumitomo Corporation, one of the world's leading integrated trading and investment firms, and its largest subsidiary, Sumitomo Corporation of America, Presidio acts as the early stage IT investment vehicle for Sumitomo Corporation and its affiliates. For more information about Presidio Venture Partners, visit www.presidiovp.com.


About Sumitomo Corporation

Sumitomo Corporation (the "Company") is one of the major Japanese "sogo shosya," or integrated trading companies. As a "Globally Integrated Trading Corporation," the Company and its consolidated subsidiaries (together, the "Companies") purchase, distribute and market a wide variety of goods and commodities including raw materials, industrial goods, and consumer goods, for domestic trade in Japan, trade between Japan and other nations, and trade between third-party nations.
The Companies also provide various services, such as financing for customers and suppliers, planning, coordinating and operating industrial projects, and gathering a broad range of information. The Companies engages in a wide range of business activities - developing market potential, providing services for logistics and transportation and for information and communications, engaging in construction, developing natural resources, functioning as an organizer, investing in the growing high-technology and multimedia fields, and promoting environmental protection.
For more information about Sumitomo Corporation, visit www.sumitomocorp.com.


About Ellacoya Networks

Ellacoya Networks is an innovative technology company building breakthrough IP service control platforms for broadband service provider and carrier markets, with announced customer deployments at Aurora Cable Internet, Cedar Falls Utilities, Coldwater Board of Public Utilities, Eastlink Cable Systems, Murray Electric System, Muscatine Power & Water, Partner Communications and University of South Florida.

A leader in IP Service Control for cable broadband operators, Ellacoya's IP Service Control SystemTM brings visibility, control and new services to broadband networks. With the Ellacoya system, operators can immediately increase customer satisfaction and reduce costs, while collecting data and preparing their infrastructure for new sources of revenue longer term. Recognized as one of the most promising telecommunications start-ups by Telecommunications Magazine and recipient of numerous "Investor's Choice" awards, Ellacoya Networks is privately held and headquartered in Merrimack, New Hampshire. For more information contact us at +1 603.577.5544, or visit us at www.ellacoya.com.





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