Hi Sourav,
The UAS cann't send new offer in initial INVITE as per standards.
Although above scenario can be propitiatory where sdp in 200 OK can be
treated as answer but again as per standards sdp should be same in 1xx and
2xx responses. This will depend on client but yes above can work in some
cases as B knows where to send media packets.
Thanks and Regards,
Vivek Talwar
On Wed, Oct 15, 2014 at 8:21 PM, Mustafa AYDIN <mustafa.ay...@verscom.com>
wrote:
> Phil,
>
> I agree the messaging after 200 ok is incorrect but the main question is
> with the CRBT which is sent before 200 ok. Why do u think that the client
> would not get early media if the sdp in INV is correct ?
>
> Rgrda
> Mustafa
>
> From: sip-implementors-boun...@lists.cs.columbia.edu [
> sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of Paul Kyzivat
> [pkyzi...@alum.mit.edu]
> Sent: Wednesday, October 15, 2014 5:47 PM
> To: sip-implementors@lists.cs.columbia.edu
> Subject: Re: [Sip-implementors] can CRBT palyed without Reliable
> Provisonal response.
>
> On 10/15/14 10:22 AM, Sourav Dhar Chaudhuri wrote:
> > Hi,
> > Can CRBT works without using Reliable Provisional Response ?
> >
> >
> >
> > A ================ INVITE (with SDP offer)
> ========================> B
> >
> > A <=============== 180 ringing (with SDP answer )
> ==================== B ----------------------> It is not a RPR
> >
> > CRBT Played
> >
> > A <=============== 200 OK for INVITE ( new SDP offer)
> =============== B
> >
> > A ================= ACK (new SDP answer)
> =======================> B
> >
> >
> > Whether the above diagram is a correct call flow for CRBT without using
> Reliable Provisional response?
>
> This is not correct, and wouldn't be correct even if the 180 was reliable.
>
> See RFC6337.
>
> Thanks,
> Paul
>
> > Regards
> >
> > Sourav Dhar Chaudhuri
> > _______________________________________________
> > Sip-implementors mailing list
> > Sip-implementors@lists.cs.columbia.edu
> > https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
> >
>
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