What build of IP Office version 7 do you have ?
I had the issue on an earlier version of 7 after the server had rebooted and installed a load of updates.
The solution was to upgrade the IP500,CCR, VM pro and One X all to the last version of 7.0.
Avaya, Alcatel, Panasonic, 3com NBX, Swyx, 3cx
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Avaya ACIS SME
Alcatel ACFE
Jack of all, Master of none!