[asterisk-users] How to read SIP debug?

[Rizwan Hisham]

Hi all,
i need to study the SIP protocol. can anybody tell me about any ebook which
could halp me understand the sip protocol, architecture, and how to read and
understand the sip signalling when i use "sip debug" in asterisk?

-- 
Rizwan Hisham
Software Engineer
AXVOICE Inc.
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