On 6/24/15 9:28 AM, Gaurav Khare wrote:
Hi,
I have a SIP client sending below SDP
...
m=audio 8178 RTP/AVP 96 97 98 99 100
a=rtpmap:96 AMR-NB/8000
a=fmtp:96
mode-set=0,1,2;mode-change-period=2;mode-change-capability=2;mode-change-neighbor=1;max-red=0
a=rtpmap:97 AMR-WB/16000
a=fmtp:97
mode-set=0,1,2;mode-change-period=2;mode-change-capability=2;mode-change-neighbor=1;max-red=0
a=rtpmap:98 AMR-WB/16000
a=fmtp:98
mode-set=0,3,4;mode-change-period=2;mode-change-capability=2;mode-change-neighbor=1;max-red=0
a=rtpmap:99 telephone-event/8000
a=rtpmap:100 telephone-event/16000
a=fmtp:98 0-15
...
Now please let me know which of the telephone-event payload should my SIP
server select considering
1. I select AMR-NB (PT=96)
2. I Select AMR-WB (PT=98)
Is there any dependency of clock frequency of telephone-event on the selected
audio codec.
IIUC there is a requirement that the clocks match for any one SSRC. So
you should select matching pairs.
It is possible that you could accept all PTs, and use one frequency for
one SSRC and another frequency for some other SSRC.
Thanks,
Paul
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