DTMF Problem

[George Stavrianos]

Hi, When i try to configure the dtmf on my phone devices on Inband after some days all devices return to RFC2833, my phone divices are Fanvil (X5u, X5s, X1s, X1, X3u) Yealink t23G

 

[eddv123]

Although it should be supported it is worth noting that inband is an older version of DTMF and if possible should not be used in applications where possible: https://www.voipmechanic.com/dtmf-issues.htm#:~:text=rfc2833- (Preferred setting in most,help establish the call's parameters.

Inband DTMF tones are sent in the audio stream where 2833 tones are taken out of the main RTP stream and into their own RTP stream.