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The incoming calls to a particular IP phone extension registered to Cisco CallManager are forwarded to an external phone number even though the call forwarding option is unchecked
The call forwarding option is checked on the user page, but even after the option is unchecked, calls are still forwarded to the number which was previously configured.
The phone line configuration on the Cisco CallManager Admin Page to which the IP phone is registered shows that calls are not forwarded.
If you restart the Cisco Telephony Call Dispatcher (TCD) Service, it does not resolve the issue. None of the shared lines with regards to this extension do not forward calls.
The Cisco CallManager traces show that the calls to this particular extension are forwarded to the external public switched telephone network (PSTN) number. It is unusual that the forward source is blank.