DTMF issues

[liambm]

Hi all

New to 3CX, we moved over from Elastix last week. Initially I had some trouble with the digital receptionist/IVR, in that it wasn't seeing any DTMF tones come through from inbound calls. The IVR greeting would just play over and over and any key press from the inbound call had no result. After a pretty thorough forum search I tried a few different things and upgrading our router firmware seemed to do the trick. However, as of this afternoon the issue has resurfaced, it was working perfectly this morning. Nothing has changed, some automatic updates happened over the weekend but that was a few days ago.

3CX version is 16.0.676
SIP provider is mVoice, who are supported
Codecs on the trunk are set to G711 a.law (first) and G711 u.law (second)
Firewall test passes (and again nothing has changed in the last few hours, since it was last working)

Any advice would be appreciated, thanks.

 

[eddv123]

What endpoints are you using, have you run a trace to see the type of DTMF that is being used (RFC 2833 or SIP INFO)

RFC 2833 (Preferred setting in most cases) sends digits in a separate audio stream.
SIP INFO sends digits in SIP messages.

If your provider is supported, it may also be worth checking what type of DTMF they support:
https://www.3cx.com/partners/voip-providers/

 

[liambm]

Thanks for the response - it's RFC2833. Oddly enough, it started working again shortly after I posted this thread. So seems to be an intermittent issue