How to specify the dtmf_pt value during DTMF transcoding
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Ray Yang
Nov 7, 2025, 7:22:42 PMNov 7
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Hi, team
I am using Kamailio 6.0.4 and RTPEngine Master to transcode INBAND DTMF to RFC2833.
rtpengine_offer("SIP-source-address replace-origin replace-session-connection codec-transcode-telephone-event always-transcode");
Offer SDP:
v=0
o=1000 1762483843 1762484950 IN IP4 192.168.43.68
s=Kapanga [1762483843]
c=IN IP4 192.168.43.68
t=0 0
m=audio 5136 RTP/AVP 8 0
a=rtpmap:8 pcma/8000
a=sendrecv
a=maxptime:20
a=ptime:20
a=rtpmap:0 pcmu/8000
Forwarded SDP:
v=0
o=1000 1762483843 1762484950 IN IP4 192.168.43.62
s=Kapanga [1762483843]
t=0 0
m=audio 39856 RTP/AVP 8 0 96
c=IN IP4 192.168.43.62
a=rtpmap:8 pcma/8000
a=rtpmap:0 pcmu/8000
a=rtpmap:96 telephone-event/8000
a=fmtp:96 0-15
a=sendrecv
a=rtcp:39857
a=ptime:20
a=maxptime:20
The current dtmf_pt is 96.
How can I specify it as 101?
Thanks!
Richard Fuchs
Nov 10, 2025, 6:26:46 AMNov 10
to rtpe...@googlegroups.com
On 07/11/2025 20.22, Ray Yang wrote:
> The current dtmf_pt is 96.
>
> How can I specify it as 101?
There is no way of doing that currently. Reason being that any UA that
> The current dtmf_pt is 96.
>
> How can I specify it as 101?
requires a certain payload number for DTMF or any other codec without a
fixed allocated number is inherently broken. If you encounter such a UA
then you should report it as broken.
Cheers
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