Make sure both the handset and line cords into the telephone are securely connected.
Note that there may be a slight operational delay if you unplug and reconnect the telephone.
If you have a 4612 or 4624 IP Telephone, check to be sure the telephone is powered (press Menu, then Exit); if the system does not display anything on the display, check your power source.
If you have a 4612 or 4624 IP Telephone, check to be sure your telephone is communicating with the switch; press Menu, then any of the softkey features (for example, Timer). If the selected feature activates, the switch/IP telephone connection is working.
Reset or power cycle the telephone.
See your Telephone System Administrator if the above steps do not produce the required result.
