[SIPForum-techwg] Support for re-INVITE without SDP
spencer at wonderhamster.org
Thu Feb 5 12:24:37 EST 2009
Making sure that I am tracking this thread...
If we stick text about this requirement in SIPconnect/1.1, I'm thinking it
should go in Section 16.1 - do others agree?
From: "Theo Zourzouvillys" <theo at crazygreek.co.uk>
> On Wed, Jan 28, 2009 at 2:32 PM, <Glauco_Barcotti at mitel.com> wrote:
>> Could we say that "Audits" (unchanged SDP offers) must have the same
>> sess-version and consequently the SDP answer shouldn't be changed either?
> No, as the SDP answer can be different even if the offer is the same
> version. See RFC 3264, sect 8, paragrph 3:
> If the version in the origin
> line does not increment, the SDP MUST be identical to the SDP with
> that version number. The answerer MUST be prepared to receive an
> offer that contains SDP with a version that has not changed; this is
> effectively a no-op. However, the answerer MUST generate a valid
> answer (which MAY be the same as the previous SDP from the answerer,
> or MAY be different), according to the procedures defined in Section
> note the "which MAY be the same as the previous SDP from the answerer".
> ~ Theo
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