AT&T MERLIN LEGEND Release 4.0 Feature Reference page 269

Feature Reference
Overflow Threshold Time
In Release 4.0 systems, there is also an Overflow Threshold Time setting. The
Overflow Threshold Time is the maximum time that any call can remain in the
calling group queue before it is sent to the Overflow Receiver. If the Overflow
Threshold Time is set to 0 seconds (factory setting), then Overflow by time is off.
If the Overflow Threshold Time is set to any other valid setting (1–900 seconds),
then calls that remain in the Calling Group Queue for a time equal to or greater
than the Overflow Threshold Time are sent to the Overflow Receiver.
If you want the Overflow Threshold Time setting to be the primary source for
overflow, you should set the Overflow Threshold setting to a large number of
calls (for example 99 calls). If you want to have overflow by number of calls in
the queue, set the Overflow Threshold Time to 0 seconds; this turns off overflow
by time.
Overflow Receiver
When the number of calls waiting in the calling group queue reaches the
overflow threshold, calls can be sent to an overflow receiver, which can be
another calling group or the Queued Call Console (QCC) queue. Only one
calling group or the QCC queue can be programmed to provide overflow
coverage for the same calling group, and each calling group or the QCC queue
can provide overflow coverage for more than one calling group. If no overflow
receiver is programmed, the call continues to ring in the queue until it is
answered or the caller hangs up.
Calling Group Overflow Receiver
Calls to do not go to an overflow receiver that is a calling group until each of the
following conditions is met:
The number of calls in the queue is equal to or greater than the
programmed overflow threshold or the time a call has been in the queue
is over the Overflow Threshold Time.
The overflow calling group has an available calling group member.
No other calls are already queued for the overflow calling group.
If all conditions are met, the calls are directed to the overflow receiver on a
first-in/first-out basis until the number of queued calls in the covered calling
group is less than the overflow threshold. The system searches for an available
calling group member according to the hunt type assigned to the sending
calling group. Calls that overflow to a secondary group cannot overflow again or
hear a second announcement.
When the overflow group type is set to Auto Logout and an overflow call is not
answered within 30 seconds (5 rings), the overflow calling group member is
logged out. The call is returned to the sender calling group's queue and is
placed at the front of the queue. The caller does not hear the sender's delay
announcement even if the call was sent to the overflow calling group before the
caller heard the delay announcement.
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Group Calling