In a 2851 controlled by MGCP, i have a prblem with an analog phone connected to a vic2-2FXS, when a call this phone it's ring and when hang-off the call isn't istablished, and i don't have tone if want to call from this phone.
Likely your incoming dial peer isn't being matched correctly. 'debug voip dialpeer' should show a dial peer with 'service mgcpapp'. Then, you should go into CUCM and make sure this port is shown as registered. That should make sure you have dial tone.
I haven't seen any cases where taking the phone off hook doesn't answer the line. My guess is either a bad phone (and this could explain the other problem), or it is not registered and this just isn't a very clear statement.
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