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 ...

VoIP in-depth: An introduction to the SIP protocol, Part 1 As a follow-up to our previous SIP primer, Ars takes you deep inside the … ...

Barrett Lyon has created a don't miss resource that shows you how to configure P2P SIP URI (Uniform Resource Identifier) dialing on your Asterisk-based PBX."There are thousands of people that ...