the port number is set to zero to alert Alice that he doesn't want to receive any video stream (use case 1). if he wants to receive the stream but want to alert Alice that he can't send video stream then add "a=recvonly" attribute (use case 2).
--- En date de : Ven 19.3.10, Iñaki Baz Castillo <[email protected]> a écrit : De: Iñaki Baz Castillo <[email protected]> Objet: Re: Re : [Sip-implementors] Does SIP/SDP allow one-way RTP? À: "Bossiel thioriguel" <[email protected]> Cc: [email protected] Date: Vendredi 19 mars 2010, 2h54 2010/3/19 Bossiel thioriguel <[email protected]> > > Alice MUST add the new "m=video" line below the old "m=" lines in the new > Offer (The order is important). Bob should accept the Offer by sending a SDP > response containing a "m=video" line with a port number equal to zero. If bob SDP contains port zero for the video stream, where will alice send the video streman then? Doesn't port zero mean that such media stream is dissabled? > References: RFC 3264 subclause 6 (for the answer with port =zero) and RFC > 3264 subcaluse 8 (for the media order). > I have listed here > (http://betelco.blogspot.com/2010/03/sdp-offeranswer-soa_2993.html) some use > cases. 8.2 Removing a Media Stream Existing media streams are removed by creating a new SDP with the port number for that stream set to zero. [...] Removal of a media stream implies that media is no longer sent for that stream, and any media that is received is discarded. So this means that one-way RTP stream is not allowed in SDP negociation, am I wrong? Thanks a lot. -- Iñaki Baz Castillo <[email protected]> _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
