Thanks jan.then in that case, how do we tell to other end that silence suppression is supported in G729 and not in G711. What I mean is , is it possible to specify codec specific value for silence suppression in Invitr
-------- Original message -------- From: Jan Bollen <[email protected]> Date:13/11/2013 9:59 PM (GMT+05:30) To: J C Sunil Kumar Reddy <[email protected]> Cc: [email protected] Subject: Re: [Sip-implementors] Silence Suppression for G711 Hi, I would think that the a=silenceSupp attribute line applies to the whole media section and not to just one codec. If the SDP body does contain the "annexb=yes" attribute, the codec built-in silence suppression mechanism is used (if the peer UA agrees to use this type of codec) else the a=silenceSupp is applied, which might be an external VAD mechanism. When the a=silenceSupp is absent, the external, UA specific silence suppression mechanism can also be used. cheers, jan On 13/11/2013 14:37, J C Sunil Kumar Reddy wrote: Hi, How to say to other end that Silence Suppression is supported in G729 and not supported in G711? Because if annexb is not present in SDP for G729, then it means that Silence Suppression is supported(i dont know why it is reverse). putting like this below will work In the INVITE ? m=audio 49152 RTP/AVP 0 18 8 101 a=rtpmap:0 PCMU/8000 a=rtpmap:18 G729/8000 a=rtpmap:8 PCMA/8000 a=silenceSupp:off------- a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 a=silenceSupp:off------- attribute is global for all codec's or only for the last rtpmap before it ? Regards, Sunil _______________________________________________ Sip-implementors mailing list [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
