08-10-2007 10:11 AM - edited 03-14-2019 11:01 PM
Hello,
I have a DID provider who sends DTMF tones using payload-type 96 as opposed to a more common 101:
m=audio 5960 RTP/AVP 18 0 4 8 96 100 102 103 104 105
Apparently, AS5300 with c5300-is-mz.123-19.bin IOS can not negotiate DTMF transfer mechanism:
m=audio 19034 RTP/AVP 18
When I tried to enter command "rtp payload-type nte 96" on the incoming dial-peer, I got a message "ERROR: value 96 in use!". Is there a way to make Cisco speak payload-type nte 96 to the originating provider?
08-11-2007 04:33 AM
The problem with DTMF transfer mechanism negotiation is even bigger than I initially considered it to be. Inband-voice becomes the negotiated DTMF relay mechanism in cases when SDP offer from the caller contains codecs 18 96 100 (18 stands for g729) and also 18 101. In these cases the SDP answer from Cisco contains only 18. Only when SDP offer contains 18 101 100, Cisco puts them in the answer too and rtp-nte becomes the negotiated DTMF relay. I would find it incredible if I were the first one to run into this sort of problem. Any suggestions how to make the gateway respect payload types 96 and 101 without 100?
12-14-2007 05:54 AM
Hi Andrew,
Did you find any solution to this problem? I am having exactly the same problem and would apprciate any help!
Thanks
Richard
12-14-2007 06:38 AM
Yes, i have remapped payload type cisco-codec-fax-ind which was using value 96 to a different number (102). This configuration works for me:
voice class codec 101
codec preference 1 g729r8
codec preference 2 g729br8
codec preference 3 g723r63
codec preference 4 g723r53
codec preference 5 g711ulaw
!
dial-peer voice 123 voip
application calling_card
incoming called-number 123
rtp payload-type cisco-codec-fax-ind 102
rtp payload-type nte 96
voice-class codec 101
session protocol sipv2
session target sip-server
dtmf-relay rtp-nte
no vad
12-14-2007 07:06 AM
Works for me too! Thanks very much for the info.
Regards
Richard
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