Hi! Did you figure this out?
What versions of CUCM and UCCX are you running?
What do you hear when you attempt a call?
What is the codec set to in CUCM and UCCX?
Can you post the MIVR logs for when you attempt this? (c:\program files\wfavvid\log\mivr) JTAPI logs are good too.
Can you include the time of the test, calling number, and called number?