You are welcome. It is what we use also. Two remarks however: - Not all SIP devices (phones) support the seperation into recvonly and sendonly. - I am not sure if some devices will not interpret this kind of setup as 'call on hold'. Maybe someone else may shed some light on that? (rfc 3264)
Regards, Stephane van Hardeveld VirtuosoMedia Jaikar Nalthooru schreef: > Thanks a lot. It exactly answers my question. > Best regards > Jayakar > > ------------------------------------------------------------------------ > *From:* Stephane van Hardeveld <[email protected]> > *To:* Jaikar Nalthooru <[email protected]> > *Cc:* [email protected] > *Sent:* Friday, March 6, 2009 5:59:57 PM > *Subject:* Re: [Sip-implementors] SIP Conference negotiation > > You could for instance differentiate the SDP in your offer in recvonly > and sendonly: > > m=video 1338 RTP/AVP 34 > a=recvonly > a=rtpmap:34 H263/90000 > a=fmtp:34 QCIF=2 > m=audio 1340 RTP/AVP 0 > a=recvonly > a=rtpmap:0 PCMU/8000 > m=video 1342 RTP/AVP 34 > a=fmtp:34 CIF=2 > a=sendonly > a=rtpmap:34 H263/90000 > m=audio 1344 RTP/AVP 0 > a=sendonly > a=rtpmap:0 PCMU/8000 > > and the clients would response with the 'mirrored' counterpart. > > Stephane van Hardeveld > VirtuosoMedia > ----- Original Message ----- From: "Jaikar Nalthooru" > <[email protected] <mailto:[email protected]>> > To: <[email protected] > <mailto:[email protected]>> > Sent: Friday, March 06, 2009 12:53 PM > Subject: [Sip-implementors] SIP Conference negotiation > > > Dear All, > I am implementing the Audio and Video conferencing in my embedded > device using SIP protocol. Due to MIPS constraints, I need to restrict > my device to receive encoded video data in QCIF format and send the > decoded video data in CIF format(H.264 codec). That means- > - MCU receive the encoded video data in QCIF format (low mips > intensive) from participants > - MCU sends the encoded video data in CIF format to participants > My question is how to negotiate the capabilities in SIP? > Thanks in advance > Best regards > Jay > > > > _______________________________________________ > Sip-implementors mailing list > [email protected] > <mailto:[email protected]> > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
