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 ...
A team of 20 iLabs engineers spent eight days running more than 1,100 SIP interoperability tests, and the conclusion is that having multi-vendor VoIP devices work together is by no means a given. Last ...
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