We believe that the issue was primarily with the carrier that was terminating the call and that new carrier has been removed from routing. What happened was that the telephone-event was not being transmitted properly during call setup. The problem only manifested when a specific new carrier was in route and 3CX was being used. "We are not stating that it was specifically your 3CX, but it was an issue we were seeing on multiple 3CX installations in use by various clients. I started a trouble ticket with Callcentric to identify the problem and this is the final resolution I switched to in band DTMF to get it working temporarily. I also had trouble with out of band DTMF not working on a lot of calls from about July 20th thru July 24th.
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