Line Access - AT&T MERLIN LEGEND Release 2.0 Equipment And Operations Manual

Introduction
A feature commonly used in Hybrid/PBX mode is ARS. When an SA button is
used to make an outside call and the ARS dial-out code is entered, the system
selects the next available trunk from the type of pool that is most cost-effective
for the call and gives the user access to that trunk.
The system automatically provides three types of trunk pools and assigns trunks
to the appropriate pool type:
Loop-start trunks, by default, are assigned to pool number 70. This pool
is called the loop-start pool or main pool.
Ground-start trunks, by default, are assigned to pool number 890. This
pool is called the ground-start pool.
NOTE:
On initialization of a Release 1.0 system, all Imp-start and ground-
start trunk programming reverts to Imp-start. The ground-start pool
never has trunks assigned to it automatically, but must be
programmed after the ground-start ports are designated. In
Releases 1.1 and 2.0, ground-start trunks are assigned to the
ground-start pool on initialization, except in a system strapped for
Key mode operation.
Tie trunks, by default, are assigned to pool number 891. This pool is
called the tie pool.
Through system programming, the three automatically assigned pools can be
rearranged and special-function or special-user pools can be created. For
example, the main pool can be divided and smaller pools of loop-start trunks
can be assigned to different groups of users.

Line Access

To make an outside call, the single-line telephone user dials a pool access or
ARS dial-out code, and the system automatically selects an outside trunk. In
addition, SA buttons on multiline telephones allow different kinds of calls to be
made from the same buttom--outside calls on basic loop-start or ground-start
trunks or on tie trunks or special service facilities such as WATS, and inside
calls to other extensions in the system.
The following types of buttons can be assigned to multiline telephone users:
An SA Ring button is used to make and receive inside and outside calls.
When an SA Ring button is used to make an inside call, the telephone at
the destination extension rings once per cycle to indicate an inside call.
An SA Voice button is used to make and receive inside and outside
calls. When an SA 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 the person at
the destination extension 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 SA Ring button.)
Modes of Operation
1-20