With three Intercom Friends connected, a new participant (D) can make it a Four-Way Intercom Conference by making an intercom call to either (B) or (C).
Ending Four-Way Intercom
1. Press the Jog Dial for 1 second until you hear a beep to terminate all intercom connections.
2. Tap the Jog Dial to disconnect from your first Intercom Friend. Double tap the Jog Dial to disconnect from your second Intercom Friend.