To activate the CALLS WITHOUT NUMBERS feature: When the phone is idle, press MENU/SELECT. Press VOLUME? until you see Call Block, then press MENU/SELECT. Press VOLUME? until you see Calls w/o num, then press MENU/SELECT.
Check for marginal line voltage. It should be 48 v with 23+MA of current.
Some phones have a setting for use behind a PBS that will allow for lower voltages though.
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