I've faced with a situation when I call our number from PSTN DTMF is working but "show voip rtp session named-event" shows no output.
INVITE SDP received from telco:
v=0o=- 3838370 8411136 IN IP4 x.x.x.xs=-c=IN IP4 x.x.x.xb=AS:0t=0 0m=audio 11538 RTP/AVP 8 0 96b=RR:0b=RS:0a=rtpmap:8 PCMA/8000a=rtpmap:0 PCMU/8000a=rtpmap:96 telephone-event/8000a=fmtp:96 0-15a=ptime:20a=sendrecv
Can anyone clarify this for me. Thanks in advance.
Go to Solution.
There were some architecture changes between ISR G2 and G3, so in G3 (4k) the command "debug voip rtp session named-event" would not generate any output even though everything works fine.
There's enhancement request for same to be implemented - https://bst.cloudapps.cisco.com/bugsearch/bug/CSCtz60693
To troubleshoot rfc2833/nte dtmf issues the only way to use packet captures.
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Check with your service provider regarding which RTP payload code they want for rtp-nte. When I have seen rtp-nte used, the code is generally 101 and not 96.
Thank you very much for clarification Valeriy. Very appreciate it.
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