RE: [AVT] Offer/answer questions on RFC 4585

["Even, Roni" <roni.even at polycom.co.il>]

Christer
This is my view. The different between AVP and AVPF is in the RTCP
messages so if the receiver understands the SDP of AVPF nothing bad will
happen.
Roni 

> -----Original Message-----
> From: Christer Holmberg [mailto:christer.holmberg at ericsson.com]
> Sent: Tuesday, October 02, 2007 2:13 PM
> To: avt at ietf.org
> Subject: RE: [AVT] Offer/answer questions on RFC 4585
> 
> 
> Hi Roni,
> 
> >>I have a couple of questions on RFC 4585, regarding the usage with
> offer/answer.
> >>
> >>My FIRST question is: are there any TECHNICAL reasons (I know it's
> probably not allowed by RFC 3264) why a user receiving an AVPF offer,
> but doesn't
> >>support it, can't reply with AVP answer (instead of rejecting the
> stream)? My understanding is that if you offer AVPF you still have to
be
> able to do
> >>AVP, so...
> >>(The receiver of course needs to understand the "AVPF" string in the
> SDP)
> 
> >[RE:] I think that is this case the offer will include a=rtcp-fb with
> rtcp-fb-vals. Since the receiver understands AVPF but do not support
any
> feedback
> >message it will remove all rtcp-fb-val in the answers.
> >To me that looks like support of AVP so why do you want to change the
> avpf to avp.
> 
> Ok, if it works that way.
> 
> So, if I have an MGCF/MGW I can do the following:
> 
> - The MGCF answers with AVPF, but without rtcp-fb-val
> 
> - The MGCF sends AVP down to the MGW (e.g using H.248)
> 
> Regards,
> 
> Christer
> 
> 
> 
> _______________________________________________
> Audio/Video Transport Working Group
> avt at ietf.org
> https://www1.ietf.org/mailman/listinfo/avt

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