Xten, in partnership with Vonage, demonstrated new features of its SIP softphone working over a 3G UMTS network. XTEN's eyeBeam SIP softphone for VoIP and Video over IP is adding support for features such as Instant Messaging and Presence Awareness using open standards like SIMPLE and XCAP. Xten also demonstrated interoperation with Microsoft Windows Messenger. http://www.xten.com