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

[Elwell, John]

Yes, but it is not clear to me what text we are proposing.

John 

> -----Original Message-----
> From: techwg-bounces at sipforum.org 
> [mailto:techwg-bounces at sipforum.org] On Behalf Of Spencer Dawkins
> Sent: 05 February 2009 17:25
> To: Theo Zourzouvillys; Glauco_Barcotti at mitel.com
> Cc: techwg at sipforum.org
> Subject: Re: [SIPForum-techwg] Support for re-INVITE without SDP
> 
> 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
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> 
> 
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