On Wed, 2010-04-21 at 17:00 +0400, Nikolay Kondratyev wrote:
>
> > Support for re-INVITE (no SDP) in order to solicit a SDP
> > offer is mandatory. There is no way to avoid this.
> Can you please point me to the appropriate rfc? 3261?
RFC 3261
Section 13.2.1 Creating the Initial INVITE (page 79):
Concretely, the above rules specify two exchanges for UAs compliant
to this specification alone - the offer is in the INVITE, and the
answer in the 2xx (and possibly in a 1xx as well, with the same
value), or the offer is in the 2xx, and the answer is in the ACK.
All user agents that support INVITE MUST support these two exchanges.
and Section 14.1 UAC Behavior:
The same offer-answer model that applies to session descriptions in
INVITEs (Section 13.2.1) applies to re-INVITEs.
...a UAC MAY
send a re-INVITE with no session description, in which case the first
reliable non-failure response to the re-INVITE will contain the offer
(in this specification, that is a 2xx response).
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