Intercom feature is no longer working on a single extension. Using Cisco spa504G phones. Can intercom all extensions except one. Also can not page through this phone. If I setup a new page group with this phone only in the group and set busy extensions to Force, I can then page to this phone.
I have done a factory reset on the phone. No change. I am manually configuring this phone, No provisioning file to worry about.
I have dialed the intercom allow code to be sure it was not accidentally de-activated.
I think I can remove the extension and rebuild to resolve, but would like to know what has caused this issue in the first place unless it happens again.