AT&T MERLIN LEGEND Communications System PBX System Planning Manual page 61

Trunks
3-6 Trunk Connections
If the system includes loudspeaker paging, designate one or more trunk jacks
for the paging equipment. A maximum of three trunk jacks can be designated
for paging systems.
If you plan to use the Maintenance Alarm feature (an audible alert for system
maintenance problems requiring immediate action), designate a trunk jack for
the external alert.
To make it easier to add outside trunks in the future, use the last trunk jack(s) on
the right-most module with either LS or GS/LS trunk jacks to connect auxiliary
equipment.
Planning Form Instructions
Use the Floor Plan and AT&T Equipment List to verify the auxiliary
equipment to be connected.
At the top of Form 2c, fill in the logical IDs for each type of auxiliary
equipment planned.
1 .
Next to "Music-on-Hold," write the logical ID of the trunk jack for this
equipment. Include the music source (tape, radio, etc.) on the line
provided.
2 .
Next the "Loudspeaker Page,: write the logical ID(s) of the trunk jack(s) for
the paging equipment (maximum of 3).
3 .
Next to "Maintenance Alarm," write the logical ID of the trunk jack for the
Maintenance Alarm external alert.
Note: If you use equipment that rebroadcasts music or other copyrighted
materials, you may be required to obtain a copyright license from, and pay
license fees to, a third party such as the American Society of Composers,
Artists, and Producers (ASCAP) or Broadcast Music Incorporated (BMI). Or, you
can purchase a Magic on Hold system, which does not require you to obtain
such a license, from AT&T or your authorized dealer.