Bug#989012: linphone: DTMF tones seem to be incorrect

[Dennis Filder]

Control: tag -1 unreproducible moreinfo

On Sun, May 23, 2021 at 03:14:42PM +0200, Detlef Vollmann wrote:

> When dialling into a telephone conference system the DTMF tones
> for the conference ID produced by the popup keypad are not
> recognized by the system.
> I'm not even sure that I used the correct keypad, as it has an
> additional column with letters, but I couldn't find another one.
> With the old version from buster I don't have such problems.

Linphone supports two different modes for sending DTMF (default: RFC
2833).  You can configure which to use under: Menu -> Preferences ->
Network -> Transport -> DTMFs sending method

Let me know if switching that fixes this for you.  Also, could you
tell me which teleconferencing system you're connecting to (vendor,
product, version)?  That information can be helpful in tracking
interoperability problems.

Regards,
Dennis.