Hi Aneesh, When using comfort noise with a codec that has clock rate other than 8000 Hz, a dynamic payload type mapping (rtpmap attribute) is required for CN payload 13. For the PCMU/8000, you do not need to send "a=" for CN payload 13. Please refer RFC 3389 (Sec 5.1) for details.
Thanks and Regards, Nidhi Kakkar -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Aneesh Naik Sent: Wednesday, May 28, 2008 5:44 PM To: [email protected] Subject: [Sip-implementors] Comfort noise Negotiation in SIP SDP Hi, While negotiating Comfort Noise in SIP SDP, is it mandatory to have a= for CN payload 13? For Eg: m=audio [media_port] RTP/AVP 0 13 a=rtpmap:0 PCMU/8000 is it ok to send SDP in this format or m=audio [media_port] RTP/AVP 0 13 a=rtpmap:0 PCMU/8000 a=rtpmap:13 CN/8000 We need to have the a= line for CN payload? Thanks, Aneesh _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors "DISCLAIMER: This message is proprietary to Aricent and is intended solely for the use of the individual to whom it is addressed. It may contain privileged or confidential information and should not be circulated or used for any purpose other than for what it is intended. If you have received this message in error,please notify the originator immediately. If you are not the intended recipient, you are notified that you are strictly prohibited from using, copying, altering, or disclosing the contents of this message. Aricent accepts no responsibility forloss or damage arising from the use of the information transmitted by this email including damage from virus." _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
