[Freeswitch-users] Detect inband DTMF on B-leg

[kaiduan xie]

 Are you talking about the following case?
A makes a call to FS, and FS sends it to B as below.
A ----> FS ----> B
And in 200 from B, there is no telephone-event in SDP, and you need to convert DTMF from A in telephone-event to in-band audio to B.
/Kaiduan

    On Wednesday, May 12, 2021, 11:29:12 a.m. EDT, Igor Potjevlesh <igor.potjevlesch at gmail.com> wrote:  
 
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Hello,


I'm working with start_dtmf in order to transcode inband DTMF to RTP-Event.

That's working fine but I'm wondering how could I check the B-leg SDP to match if there's or not "telephone-event" to do it only if require. That would also allow me to do RFC2833 to inband from A-leg to B-leg.

I can easily check ${switch_r_sdp} for A-leg, but I can't figure out how to check 200 OK SDP and update the DTMF behaviour accordingly.

  

Any idea? Thank you.

  

Regards,

  

Igor.



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