We are running CCM 5.1 and have a SIP trunk configured in the Call Manager. Calls are routing fine but DTMF relay is not working. I have worked with the carrier and we have tried many variances in the configuration with no luck.
The carrier has commented that they have many SIP truncks that terminate with CCM 4.x but that they have had many issues with CCM 5.1
Many of our discussions have centered around the implementation of the Media Termination Point.
Anyone have any experience resolving this type of issue in CCM 5.1?