Error sending DTMF

[mkayander]

Having issues with using DTMF commands when calling outer numbers.
Example: called a provider service number and needing to go through the menu.
Whenever i press any digit during any call i get this error in console:

ERROR[6627]: at_response.c:504 at_response_error: [dongle1] Error sending DTMF

Tried on 4 Huawei E171 sticks. Modes and providers can be seen here:

Here's some more detailed settings of one of them:

Am i misconfigured something? I would really appreciate help with this.
Tell me if any additional info needed.
Thanks!

[ruijorgesilva1]

On dongle.conf try to change
dtmf=inband
save
reload core asterisk
Try again
Some operators have this dtmf diferences
For me everything was working until i changed to Vodafone.

Regards
Rui