Cortelco 2420 Telephone User Manual


 
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LCD CONTRAST
1. Press MENU until -3- and LCD CONTRAST appears. -3- flashes.
2. Use the dial pad to key in the value or press to increase the setting, to decrease the setting. The phone
has five (1–5) display contrast settings.
3. Press OK or MENU to complete the setting and go to next setting, or press DELETE to complete the setting and
return to standby mode.
4. The default LCD CONTRAST setting is 3.
TIME/DATE
NOTE: It is not necessary to set the time and date if you have Caller ID service.
1. Repeatedly press MENU button until “SET TIME/DATE“ appears and the hour flashes.
2. Press to increase the setting, to decrease the setting. Or use the keypad buttons to set the time and date
manually. Press or to choose AM, PM.
3. Press OK to move between the different settings. The default time/date setting is 12:00 am 01/01(hh:mm
mm/dd). The local clock will also be updated automatically when a caller ID is received.
4. Press MENU to complete the setting and go to next setting, or press DELETE to fail the setting and return to
standby mode.
CALL WAIT ID ON/OFF
1. Repeatedly press MENU until “CALL WAIT ID ON“ appears.
2. Press or to choose CALL WAIT ID ON/OFF. The default CALL WAIT ID setting is OFF.
3. Press OK or MENU to complete the setting, or press DELETE to complete the setting and return to standby
mode.
MESSAGE WAITING
If you subscribe to your phone company's message waiting service, your phone will inform you when you have a message.
When you receive a message, the display will show MSG WAITING ON and and the new call LED will flash. MSG
WAITING ON disappears from the display after 8 seconds, but is displayed and the new call LED will flash until you
retrieve the message.
NOTE:
The phone is compatible with both FSK and Stutter Dial Tone message waiting. There is a switch on the base of the
phone to disable the Stutter Dial Tone message waiting.
BATTERY COMPARTMENT
Your phone has a battery compartment which will hold 4 AA batteries. These batteries are not necessary for normal
operation. If the batteries are installed, the Caller ID and the handset amplifier will continue to work during a power failure.
RESETTING THE PHONE
If your phone stops working properly, use a straightened paper clip to press RESET on the back of the phone.