Help DTMF being repeated randomly

General Help
1

Hello Guru’s

Not sure what has happened, but use webex for a lot of my conference calls, and it uses DTMF to identify conference. I have a collection of Cisco 7970’s, 7971 and adore soft phone, the fault is across all of these.
using the raspberry Pi as freepbx server.

Problem:
DTMF numbers are randomly being repeated.

Troubleshooting so far:
tried changing the DTMF in the SIP file:
101
3
avt

tried altering the DTMF mode in freepbx.
auto/rfc2833, the SIP ones don’t seem to work

tried an older version of freepbx, different phones, etc.

is there a way to debug what is being sent, or option to add a dtmf delay, or another fix?

many thanks, Adrian.

2

looks like a voipdiscount issue, as have configured sipgate as outgoing trunk/route and works fine, so have altered my dial plan to use sipgate for my conference calls until I hear back from voipdiscount