Vonage® Selects Xten's X-PRO as the 'Softphone of Choice'

Vonage's cutting edge Voice over IP service now available with X-PRO, the leading SIP Softphone from Xten

EDISON, N.J. and SANTA CLARA, Calif. — March 23, 2004 —

Vonage, the fastest growing telephony company in the US, and Xten Networks, publisher of the award winning X PRO softphone, announced today that Vonage and Xten have completed interoperability testing of an OEM version of Xten's X-PRO SIP softphone for use on Vonage?s Voice over IP (VoIP) service.

Vonage customers can now sign up for Vonage, download and install the Vonage X-PRO softphone, and start making and receiving telephone calls immediately on their computers, while maintaining the same quality of service they have come to expect.

"Road Warriors" using the Vonage X-PRO softphone can access the Vonage service from almost any Internet connected personal computer. The Vonage X-PRO softphone provides increased mobility of the Vonage service; this along with the feature-rich X-PRO's ease-of-use, make it a winning combination.

"We are really excited to partner with Xten to offer our customers the best Softphone on the market," said Michael Tribolet, Vonage's executive vice president of operations. "This partnership underscores our commitment to bringing the most cutting edge applications coupled with great features and prices to the consumer marketplace."

"VoIP services have come a long way since the mid-nineties and to see them replacing circuit-switched primary line services marks a new era for the telephone," said Erik Lagerway, co-founder and Chief Operating Officer of Xten Networks, Inc. "Xten is proud to have Vonage as a customer and we are excited about the opportunities this new partnership will foster."

The Vonage X-PRO softphone is available for personal computers running Windows 98SE/NT/ME/2000/XP operating systems.

About Vonage®

Vonage is redefining communications by offering consumers and small businesses an affordable alternative to traditional telephone service. The fastest growing telephony company in the US, Vonage's service area encompasses more than 1,900 active rate centers in over 113 US markets. Vonage is sold directly through www.vonage.com and retail partners such as Amazon.com and Circuit City. Wholesale partners such as EarthLink, ARMSTRONG(R), Advanced Cable Communications and the Coldwater Board of Public Utilities resell the Vonage broadband phone service under their own unique brands. With more than 125,000 lines in service, Vonage continues to add more than 15,000 lines per month to its network. Over 5 million calls per week are made using Vonage, the easy-to-use, feature-rich, flat rate phone service. Vonage is headquartered in Edison, New Jersey. For more information about Vonage's products and services, please visit www.vonage.com or call 1-VONAGE-HELP. Vonage(R) is a trademark of Vonage Holdings Corp.

About Xten Networks, Inc.

Xten is a leading provider of award-winning, high-quality SIP (Session Initiation Protocol) Voice over Internet Protocol (VoIP) software and SIP softphones. It is Xten's goal to be the primary choice in softphones and client-side IP communications software for telephony software consumers the world over. Xten provides IP Telephony software products directly to end users, Enterprises, Next-Gen Service Providers (ITSPs & Tier 2), Wireless Internet Service Providers (WISPs), Telephone Companies (TELCOs), and Original Equipment Manufacturers (OEMs). Xten partners with Service Providers and the like to offer turnkey IP Telephony solutions. Those who are interested in Xten products should visit sales.xten.com. Xten is a private Nevada corporation located in Santa Clara, California. On the Web: www.xten.com.