By default, pressing Intercom and dialing 911 or lifting the handset and
dialing 911 will not call emergency services.
To place a call over a Line Group:
Lift the handset and press INTERCOM.
Dial the Line Group code (90-98).
If you hear dial tone after dialing the 9, your system doesn't have dial access to
Line Groups enabled. See Line Group Routing
instead.
If you hear busy tone and your extension has Line Queuing, you can dial
2 to queue for a line to become free. If you hang up, the
system converts the queue to a Line Callback.