AT&T MERLIN LEGEND Release 4.0 Feature Reference page 101

Feature Reference
Forward and
Follow Me
(continued)
Group Calling
Headset Options
Hold
Line Request
Multi-Function
Module
Music On Hold
If a forwarding extension is busy when a user calls, the user can queue
the call for callback. Callback is completed when the forwarding
extension is no longer busy. If the forwarding extension and the
forwarded-to extension are available, the call rings at both extensions. If
the forwarded-to extension is not available, the call rings at the
forwarding extension only.
If an inside caller using Automatic Callback calls an extension with
Remote Call Forward and no pools are available, the caller hears
queuing tone, but the call queues for the extension only, not for the
remote number. When the extension becomes available, dequeuing
tone is heard and the call is placed to the extension (not the Remote
Call Forwarding number) if the user has stayed on the line. If the caller
has hung up, priority ring is heard as the callback call is dispensed to
the caller.
If an inside caller without Automatic Callback on calls an extension with
Remote Call Forward and no pools are available, the call follows the
extension's coverage path, if any. If there is no coverage and the inside
caller activates Selective Callback while listening to the busy signal, the
call queues for the extension but not for the Remote Call Forward
number.
Calls made to a calling group are not eligible for Callback because the
call rings into the calling group's queue. However, Callback can be
used for calls to individual calling group member extensions or to the
delay announcement device. Calling group calls are not sent to a group
member when the member has used Callback for a busy extension or
pool, or if another person used Callback to reach the member and the
callback call is ringing on the member's telephone.
Callback calls are answered automatically by using Headset Auto
Answer, but the user hears the out-of-queue tone instead of the zip
tone. When both calling and receiving users have headsets with
Headset Auto Answer activated (MLX telephones only), the person
being called hears the zip tone when the callback call is completed; the
callback originator does not hear zip tone or dequeuing tone.
Pressing the Hold button while waiting for a queued call is similar to
hanging up (the green LED flashes next to the line button, indicating
that the button is being used for the queued call).
Returning callback calls cancel Line Request.
Both Automatic and Selective Callback can be used from an MFM;
however, a callback call cannot be manually canceled because the
MFM does not recognize the switchhook flash produced by pressing
the Drop button.
An outside caller waiting in the callback queue hears Music On Hold if it
is programmed.
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Callback