IBM 4 LINE TELEPHONE WITH CALLER ID -412CID - Manual (Page 26)

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7. If the called number is set on Do Not Disturb [DND], you will hear an ICM busy tone. The called
party will not hear anything, but that extension’s ICM LED will flash.
ANSWERING AN INTERCOM CALL
Answering an Intercom Call with the Handset
1. Lift the handset. You will know you are receiving an intercom call because the [ICM] LED flashes,
the display will show “ICM” on the screen and you will hear the distinct ICM ring (a double ring).
2. Your phone will automatically connect the intercom call, so you are free to begin your conversa-
tion.
Answering an Intercom Call with the Headset
1. Press the flashing [ICM] key or press the [SPKR] key to receive your intercom call.
2. You will know you are receiving an intercom call because the [ICM] LED flashes, the display will
show “ICM” on the screen and you will hear the distinct ICM ring (a double ring).
3. Begin your conversation.
Answering an Intercom Call with the Speakerphone
1. Press the [SPKR] key
2. Begin the conversation.
NOTE: If your phone is set on DND when you receive an intercom call, even though you will not hear a ring
you still have the option of answering the call by pressing the [ICM] or [SPKR] key. You will see the number
of the incoming caller on your display.