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I am able the configure the device and it registers to cucm v 10.5. The registration status changes in about 2 minutes to un-registered. If I reboot the VCS754 it will register to cucm again but, as before, only stays registered about 2 minutes.
I ha...
I think this is a prime example of why you don't agree to let your customer supply their own equipment!
Anyway,
It turns out there is a "Session Timer" section in the vetch configuration. After trying multiple settings we found that Minimum Value = 9...