[SIPForum-techwg] Support for re-INVITE without SDP

[Spencer Dawkins]

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?

Thanks,

Spencer

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
>   6.
>
> note the "which MAY be the same as the previous SDP from the answerer".
>
> ~ Theo
> _______________________________________________
> techwg mailing list
> Send mail to: techwg at sipforum.org
> Unsubscribe or edit options at: 
> http://sipforum.org/mailman/listinfo/techwg
>