22.7-10-11- This button changes the format of the displayed number. Three formats are available:

7-Digit 7 Digit Telephone Number

10-Digit 3 Digit Area Code + 7 Digit Telephone Number

11-Digit 1 Digit Long Distance Code + 3 Digit Area Code + 7 Digit Telephone Number

Example: Assume the local area code is 662 and a 7 digit local number is displayed 555-1212.

Pressing the 7-10-11 button once will display the number plus area code: 662-555-1212.

Pressing the 7-10-11 button again will add the LDS code (usually 1): 1662-555-1212

Pressing the 7-10-11 button again will show the 7 digit number:

555-1212

Note: This assumes that an LDS code has been programmed into the telephone.

23.Release - To end a conversation, press RELEASE once. The phone will go on-hook for 1.5 seconds and then go off hook again to allow another call to be made.

24.Message Waiting/New Call Lamp - This lamp above the display will light to indicate a voice mail message. The 1220 is compatible with four types of message waiting: 90V, 24V, Frequency Shift Keying (FSK) and Stutter Dial Tone (SDT). Contact your telephone service provider to determine the type of message waiting. For 90V or 24V the type of message waiting is selected with a switch underneath the phone. FSK message waiting will be detected automatically. SDT message waiting must be activated in the menu. For these types of message waiting, the switch should be in the OFF position. If the phone is connected directly to a telephone line, the switch should be in the OFF position. This lamp will flash to indicate a new call. To stop the flashing use the ￿or ￿to review the calls.

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Cortelco 122000TP227S user manual