AT&T MERLIN LEGEND System Reference Manual page 489

Functional Description
Hybrid Behind Switch
Mode
4-20 Modes of Operation
In a Behind Switch system the Intercom buttons on the telephones allow users to
call other people connected to the system. When an Intercom button is pressed,
the system provides an inside talk path and dial tone from the Behind Switch
system (not the host system). Users can then reach co-workers without
interfering with the use of Prime lines.
The following types of Intercom buttons can be used to make and receive inside
calls in the Behind Switch mode:
Intercom Ring button is used to make inside calls and to receive inside calls
and outside calls transferred by another user. When an Intercom Ring button
i used to make an inside call, the call rings with a one-burst ring to indicate
S
an inside call.
Intercom Voice button is used to make inside calls and to receive inside
calls and outside calls transferred by another user. When an Intercom Voice
button is used to make an inside call, the person being called hears the
caller's voice instead of hearing the telephone ring unless the person being
called does not have a speakerphone or has disabled voice announcements.
Intercom Originate Only button is used to make inside calls. Calls are not
received on an Intercom Originate Only button. The purpose of the button is
to ensure that the user always has a button available to make a call, transfer
a call, establish conference calls, answer Call Waiting calls, or pickup
parked calls. The button can be programmed for either voice or ring
operation.
A combination of up to ten Intercom Voice, Intercom Ring , and/or Intercom
Outgoing Only buttons can be assigned to each telephone (excluding QCC
system operator positions). The number of Personal Line buttons that can be
assigned to a telephone is limited only by the number of lines allowed in the
system and the number of buttons available on the telephone.
In the Behind Switch mode, users can use the special features of both the
Behind Switch and host systems. When both systems have common features,
the customer must decide which system will be used for those features. Each
system must be programmed accordingly, and the users must be given the
appropriate access instructions.
In addition, when users press the Conference, Drop, and Transfer buttons, the
respective host system features are activated and a timed flash is sent to the
host system, followed by a programmed feature access code. (Whoever is
programming the system must obtain the feature access code for the host
system and program it to the Conference, Drop, and Transfer buttons.)
A Hybrid Behind Switch system combines the features of the Behind Switch
system with the ground-start capabilities of a Hybrid/PBX system. If a ground-
start line is directly connected to the control unit, the FCC considers the system
a hybrid.