I've been clicking around the Flash-enabled VoIP eLearning Tutorial. Authoritative, vividly illustrated, and totally cool. You click, and you see illustrated guides to how VoIP works, how to configure ...
The iptel.org 180+ page SIP tutorial is outstanding. Another overview that is a bit more market-oriented and nearly as long. White paper on the SIP value proposition over telephony, SIP and the new ...
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