E&M on E1 is relatively not standard and the PBX may differ from the router in running the protocol.
If you cannot absolutely configure PRI for this connection, thing that would solve the problem, please send here relevant config, and output of "debug vpm signal" for one successful and one unsuccessful call.
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How does the phone registered in CUCM environment?
-The phone will obtains power via PoE or AC adapter.-The phone will loads its locally stored firmware image.-The phone learns the voice vlan id via cdp from the switch.-Via...
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