I saw a great article about Pingtel and their participation at TMC's VoIP Developer Conference. Specifically this article talks about a session that is to take place Thursday of this week. If you are interested in open source PBXs, SIP and other developer topics you can click to read more about VoIP and SIP.
VoIP and SIP
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VoIP and SIP TrackBack URL : http://blog.tmcnet.com/mt/mt-tb.cgi/11244
Have you heard of a company called Damaka (www.damaka.com). Its in the just in time communication space. They use true peer to peer SIP to provide instant message, chat, voice calls, audio conference, voice mail, caller id, short text messaging to cell phones etc.
All this is done using SIP P2P which eliminates the need for centralized servers and gets rid of the scalability issue