DTMF issue with G711a

[johnvam]

Hello,
I have a very strange problem with DTMF.
When I set G711a only for codec, DTMF are not passing. When I set G711u only, DTMF works!
Have you any idea?
With the same SIP trunk from Asterisk PBXs DTMF work with all the codecs!
Thank you

 

[johnvam]

Anyone?? Any idea?
I use same VoIP provider. G711u passes DTMF, G711a doesnt...
3CX is doing transcoding or not?

 

[leejor]

Have you had a look at the 3CX Activity Log (Verbose), to see if there is any indication, that the call is changing to a different Codec?

 

[johnvam]

Have you had a look at the 3CX Activity Log (Verbose), to see if there is any indication, that the call is changing to a different Codec?

yes. trace is the same. I believe that something is not working well on 3CX transcoding

 

[leejor]

Does the Log show that it is indeed transcoding?