I have an extension that has lost dial-tone. This phone has been in service for over two years and has been working properly until now. Other buttons configured on the same phone work fine and the user can dial out, but not if using his extension. I have tried the following with no success:
-Checked the speakerphone and cabling
-Tried dialing out using the same extension on another phone (no dial-tone for the same extension on the other phones)
-Resetting the phone to factory defaults
-Removing the phone and configuring a brand new phone
Incoming calls to the extension work fine and everything looks correct on the display. The environment is Cisco CME 7 and the phone in question is a 7962.