AT&T MERLIN LEGEND Release 4.0 Feature Reference page 271

Feature Reference
Extension Status must be set to calling group/Call Management System (CMS),
the factory setting, and not hotel configuration.
The Integrated or Generic Voice Messaging Interface (VMI) group type should
not be assigned to a calling group used for fax machines.
To allow all calling group members' extensions to ring when an outside call is
not answered within three rings, the trunks programmed to ring into the queue
can also be assigned to buttons on calling group members' telephones and
programmed for Delayed Ring. This does not work for inside calls, remote
access calls, and Direct Inward Dial (DID) calls, or if a delay announcement
device is assigned to the group.
Trunks that are programmed to ring into a calling group also ring at any
telephones that have the trunk assigned to a button. If a call is answered at any
one of these telephones, the call is removed from the calling group queue. A
trunk can be assigned to a calling group and as a personal line.
A trunk cannot be programmed to ring into more than one calling group.
A trunk cannot be programmed to ring into both a calling group and a QCC
queue.
If no trunks are assigned to the calling group, only inside calls are eligible for
calling group distribution.
The calling group supervisor can log delay announcement devices in or out.
Any of the multiline and single-line telephones compatible with the system can
be used as calling group member positions.
Labels can be assigned to calling groups to identify the name of the group,
such as
, , or , on display telephones.
Do not use a Supplemental Alert Adapter with an analog multiline telephone
because a steady tone is emitted from the telephone when the visual alert is on.
The system does not prevent users who are not members of a calling group
from using the Available (ES2) and Unavailable (ES0) programmed buttons or
feature codes. Call Management System (CMS) agents who may not be calling
group members can use these same codes to log in and out of the CMS.
The published number for a calling group can be a DID number.
If the Overflow Threshold Time setting for a Calling Group is changed, any calls
waiting in the queue for that Calling Group have the time countdown reset.
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Group Calling