Abhishek Jain <mail.abhishekj...@gmail.com> writes:
> does anybody know what is sip version 3.C ?

There is no such thing as SIP version 3.C, at least in anything but
experimental use.  "3.C" does not even conform to the syntax of
"SIP-Version" (RFC 3261 section 25.1).

Sometimes people talk about SIP version 3, but that's a joke, as SIP
version 3 is envisioned as a new version that corrects all of the
problems of SIP version 2.0.  (But it would of course be incompatible
with version 2.0 and thus unusable in any existing VoIP network.)

Dale
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