UCM 7.1 Dialing out via SIP trunk

When I call out off-net - the phone (say my cell) rings.  But when I answer the call - my 7965G keeps ringing - not recognizing that the call has been answered.  I am connected to the PSTN via a SIP trunk with XO Comm.  I can't reach anyone there to try and troubleshoot.  Wanted to throw it out to the Experts here if they have a thought what this issue might be,.  Thanks.
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amigan_99Network EngineerAsked:
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amigan_99Connect With a Mentor Network EngineerAuthor Commented:
What fixed this was adding "Require MTP resource" to the trunk from UCM to the SIP gateway.  I had removed that while troubleshooting another issue.
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amigan_99Network EngineerAuthor Commented:
I found my own answer.
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