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@gmail.com> wrote:


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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