[cisco-voip] Call rings phones once and then drops

[TechGuy]

Calls ring in on local PRI trunks on 3845 router, makes its way to
callmanager, makes its way to phone and rings once on the phone.  But that
is it, calls instantly drop after first ring of the phone.  Does not give
person chance to answer just drops without any user intervention.

Using MGCP between 3845 and callmanager.

Any ideas?
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