[SIPForum-discussion] Book References On SIP

[Ken Wong (ktwong)]

Hello,
 
I have some basic understanding on SIP but want to know some more
technical detail (e.g. what are the avail messages and its meaning and
other SIP related techonology) on it without reading the various RFC.
Are there any books out there that would satisfy this requirement?
 
Thanks,
 
Ken
 
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