Solved DTMF not working

[next2]

Hi,

We moved our current IPBX install from Asterisk to 3CX, using the same SIP provider.
Since then, DTMF is not working anymore. From our desk phones, and 3CX soft phones.
So, there is probably something wrong in our SIP trunk config, or with the extension config?
What should we check ? Something with the codecs ? For now, defaults are G711a/u, which is really common.
We also tried unchecking/checking PBX delivers audio on the trunk and extension, but still no result.
Any help would be warmly welcome!

 

[leejor]

It may have something to do with the DTMF Method that your sets are using. Codec should not matter unless you are using DTMF audio only with a lower rate Codec. In the case of a VoIP provider you should be sending DTMF as a "message", and possibly as audio. Many sets have an "auto" setting.

 

[next2]

Hi, thank you for your answer!
FYI, I changed the trunk codecs list to G.711 U-law only, and now it's all right.