books
Hehehe, I know you like books :). Other nice books about FreeSWITCH are also published by Packt, like this one. Their title are: "FreeSWITCH 1.6 CookBook" and "Mastering FreeSWITCH". We know the authors, we can guarantee for them.
Another book I always counsel is "VoIP Deployment for Dummies", published by Wiley. It's not for dummies at all, and (even though it was published in 2009) will give you a complete general course 400 pages long (covering topics including SIP, LAN metrics, dealing with ITSPs, and many more).
As reference works on SIP, RFCs are there for free, and the book from Johnston, "SIP, understanding the Session Initiation Protocol", Artech House, I found it complete and easy to consult when I look for details. For the ...
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