Sorry. Colin Perkins is correct - it isn't a correct SDP. I was just considering the m= and c= lines when I made my evaluation.
Regards, Attila Attila Sipos http://www.vegastream.com >> -----Original Message----- >> From: [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] Behalf Of Attila >> Sipos >> Sent: 25 August 2005 10:02 >> To: [EMAIL PROTECTED]; SIP Implementors >> Cc: SIP IETF >> Subject: [Sip-implementors] RE: [Sip] SDP Query >> >> >> Hi Udit, >> >> Yes it is valid. The question is what did you intend it to mean? >> >> In your example, you will end up with audio with IP 224.2.17.13 >> and video with IP 224.2.17.12. >> >> The first "c=" (is a session description "c=" since it comes >> before any >> "m=" section) means use this IP address for all media unless the >> media description says otherwise. >> >> The second "c=" (is a media description "c=" because it >> comes after the "m=") >> means for this particular media use the address I've specified here. >> >> You could have, as an alternative, written your SDP like this: >> >> t=2873397496 2873404696 >> a=recvonly >> m=audio 49170 RTP/AVP 0 >> c=IN IP4 224.2.17.13/127 >> m=video 51372 RTP/AVP 31 >> c=IN IP4 224.2.17.12/127 >> >> In my example above, there is no session description "c=" so every >> media description has to have a "c=". >> >> Regards, >> >> Attila Sipos >> http://www.vegastream.com >> >> >> >> -----Original Message----- >> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] >> Behalf Of [EMAIL PROTECTED] >> Sent: 24 August 2005 21:11 >> To: SIP Implementors >> Cc: SIP IETF >> Subject: [Sip] SDP Query >> >> >> >> Hi, >> >> Just want to check if following SDP is valid: >> >> c=IN IP4 224.2.17.12/127 >> t=2873397496 2873404696 >> a=recvonly >> m=audio 49170 RTP/AVP 0 >> c=IN IP4 224.2.17.13/127 >> m=video 51372 RTP/AVP 31 >> >> It indicates different IP address used for audio and video types. >> >> I thought the reason we have connection parameter in both >> session and media description is for handling hold cases, >> where you want to hold a particular set of media instead of >> whole session. >> >> Regards, >> Udit >> >> >> _______________________________________________ Sip-implementors mailing list [email protected] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
