AT&T MERLIN LEGEND Release 2.0 Equipment And Operations Manual page 54

Introduction
Line Access
In Behind Switch mode, the telephones used most commonly are multibutton
telephones. Single-line telephones can also be used and can be set up in two
ways. In one configuration, the user has constant access to the Prime Line
buttons, but cannot make intercom calls or use system features. In the second
configuration, the user can make and receive intercom and Prime Line calls and
can use system features, but must dial a dial-out code to make an outside call.
When the system is programmed for Behind Switch mode, the system assigns a
single Prime Line, an ICOM Ring button, and an ICOM Voice button to each
multiline telephone. Two ICOM Ring buttons are assigned to each single-line
telephone; no Prime Lines are assigned. When the telephone handset is lifted,
the Prime Line is selected automatically (even when it is busy) unless the user
has first selected a different button. The Prime Line connects only with the host
system, not directly with an outside trunk.
To call another person connected to the host system, the user dials the host
system extension number assigned to that person. To access an outside trunk,
the user dials the host system's dial-out code (usually a 9), and the host system
selects an available outside trunk.
In a Behind Switch system, ICOM buttons allow users to call other people
connected to the system. When a user presses an ICOM button, the system
provides an inside talk path and dial tone from the Behind Switch system (not
from the host system). The user can then reach co-workers without tying up a
Prime Line.
The following types of lCOM buttons can be used to make and receive inside
calls in Behind Switch mode:
An ICOM Ring button is used to make inside calls and to receive inside
calls and outside calls transferred from another extension. When an
ICOM Ring button is used to make an inside call, the telephone at the
destination extension rings with a one-burst ring to indicate an inside
call.
An ICOM Voice button is used to make inside calls and to receive inside
calls and outside calls transferred from another extension. When an
ICOM Voice button is used to make an inside call, the person at the
destination extension hears the caller's voice on the speakerphone after
a single beep, rather than ringing. (If he or she has a single-line
telephone, does not have a speakerphone, or has disabled voice
announcements, the telephone rings the same as if the call had been
made on an ICOM Ring button.)
An ICOM Originate Only button is used only to make inside calls.
Neither inside nor outside calls are received on an ICOM Originate Only
button. The purpose of this type of button is to ensure that the user
always has a button available to make or transfer a call, establish a
conference call, answer a Call Waiting call, or pick up parked calls. The
button can be programmed for either voice or ring operation.
1-26 Modes of Operation