SX80s not passing any DTMF tones

[chris.aull]

Hi,

We have two SX80s running CE8.3.4 with CUCM 9.1.2.13900-10. Calls are working just fine, except that we cannot seem to pass DTMF tones on any call inside or outside of our network. We just inherited support of these devices, so I am not super familiar with them. Is likely to be an issue with their configuration, or something in CUCM?

[Wayne DeNardi]

It may be passing them, but possibly not in the way that the system at the other end of the call is expecting to receive them.

There are multiple ways to use DTMF in band or out of band.

Have a look at this old blog article which describes some of the different options: Understanding SIP DTMF Options supported by CUCM

[Patrick Sparkman]

Link in Wayne's reply didn't get formatted correct, here is the working link:

Understanding SIP DTMF Options supported by CUCM