SIP Troubleshooting: SIP Call Fail on SIP Trunk on Unified CM to Back to Back User Agent

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MTP Resource Allocated Even Though MTP is Disabled

Problem Summary	Media Transfer Protocol (MTP) Resource is allocated for each call coming into SIP trunk even though MTP disabled is selected on the trunk.
Error Message	None.
Possible Cause	Failure to negotiate DTMF method occurs for the call, according to the DTMF method supported by the endpoints involved in the call.
Recommended Action	Set the endpoints of the call to negotiate the same DTMF method, that is RFC2833 for Unified CVP calls. Note: Out of Band (OOB) Key Press Markup Language (KPML) is not supported for the Unified CVP 4.0 and 4.1 releases.
Release	Release 7.0(2)
Associated CDETS #	None.

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