However, there is also an rare possibility that the DTMF tones are already distorted as they enter your PSTN gateway (after travelling a long way through the global PSTN network), in that case, there's little we could do.
But, the good news is that most of the similar problems I have seen has to do with DTMF-relay not being configured properly on the gateway. So that is a good point to start.
Out-of-band DTMF relay is enabled by default for the 6608 gateways. We should be able to see the dtmf digits coming in from the CCM trace.
I agree the challenge here is to recreate the problem, I could first enable detailed CCM trace, then request users travelling overseas to write down details of any failures (time of occurance, calling/called number, call flow, etc)
If no users are going overseas in the near future, maybe we could ask any local contacts in those countries to make a few tests calls for us.
We could then go into the CCM trace to track the call and hopefully find out the root of the problem.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
endpoints and other SIP related issues. Even though these traces are in
clear text, these texts can be gibberish unless you understand fully
what they mean. This document attempts to br...
Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
questions and it will render the proper jabber-config.xml file for you
to copy/paste. There is built in logic to verif...
CUCM Database Replication is an area in which Cisco customers and
partners have asked for more in-depth training in being able to properly
assess a replication problem and potentially resolve an issue without
involving TAC. This document discusses the bas...