Hello, The string RTP/AVP indicates that IETF's recommendation for Real Time Protocol (RTP) using Audio/ Video Profile (AVP) to be carried over UDP is to be used for payload. If you want to transmit and receive video data using RTP, it is necessary to mention the 'RTP/AVP' string rather than just the 'AVP' string in the SDP parameters.
It is necessary to mention 'RTP' as for certain media types, e.g. audio - both RTP audio and vat PCM audio can be negotiated using SDP. In such cases as for vat PCM audio, there is no need to add the 'RTP/' prefix in the SDP parameters as the data will not be encapsulated in RTP packets. If your implementation uses RTP for payload, it will always expect the RTP prefix to be present in the SDP parameters otherwise it should lead to a parsing error and return an appropriate error code. I hope this helps. regards, Gaurav -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Sudhir Nayak Sent: Tuesday, August 02, 2005 11:59 PM To: [email protected] Subject: Fwd: [Sip-implementors] SDP parameters Hi I am still not sure if the SDP parameters I am getting is a vaild one. m=video 53000 AVP 34 The general type I have seen is m=video 53000 RTP/AVP 34 . In my case the RTP is missing. I would appreciate if anyone can tell me if the SDP parameters I am getting is a vaild one. Thank you Regards Sudhir Note: forwarded message attached. --------------------------------- Free antispam, antivirus and 1GB to save all your messages Only in Yahoo! Mail: http://in.mail.yahoo.com ********************** Legal Disclaimer **************************** "This email may contain confidential and privileged material for the sole use of the intended recipient. Any unauthorized review, use or distribution by others is strictly prohibited. If you have received the message in error, please advise the sender by reply email and delete the message. Thank you." ********************************************************************** _______________________________________________ Sip-implementors mailing list [email protected] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
