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Not bad for a little protocol developed in academia back in
the mid-1990s by such thinkers as Henning Schulzrinne and
Jonathan Rosenberg.
The authors have done an excellent job of explaining the what,
why, and how of SIP in an understandable way. Enjoy your read
of SIP Communications For Dummies, Avaya Custom Edition!
Alan B. Johnston
February 2006
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SIP guide