AT&T MERLIN LEGEND Release 4.0 Feature Reference page 100

Feature Reference
Conference
Coverage
Digital Data Calls
Display
Do Not Disturb
Extension Status
Forced Account
Code Entry
Forward and
Follow Me
100
Callback
With Automatic Callback, the call is automatically queued; however, if a
person tries to add the queued call to the conference, the system
returns a busy tone. With Selective Callback, the system also returns a
busy tone. To drop the busy tone from the conference, the originator
presses the Drop button and then the line button used to call the busy
extension.
The sender and all coverage receivers must be busy before a call to the
sender can be queued. The call is sent to coverage before it is put in
the callback queue. Once a call is in the callback queue, it is not sent to
coverage again. The callback call indicating that a busy extension or
pool is available is not eligible for Individual or Group Coverage.
Desktop video systems can be programmed for autoqueuing using
Callback. As a line becomes available in the pool, or the busy desktop
video system becomes idle, the queued call is made one B-channel at
a time. When the second B-channel become available, it is used for the
connection as well.
Although desktop video systems can use either on-hook or off-hook
queuing, you should only off-hook queuing for 2B Data connections. If
you use on-hook queuing (by hitting the End icon) the call will be
connected using only one B-channel.
When a call is queued by Automatic Callback on multiline telephones or
by Selective Callback on analog multiline telephones, the display shows
a feedback message. When an MLX telephone user activates Selective
Callback, the display prompts the user to enter the telephone number.
When the queued call rings the user's telephone, the display indicates
that it is a returning callback call.
Calls to extensions that are using Do Not Disturb are not eligible for
callback queuing. If a callback originator is using Do Not Disturb, the
system overrides the feature and the telephone rings when the busy
extension or trunk is available.
In Hotel mode, an extension in Extension Status 1 or 2 cannot use
Callback to request busy pools.
An account code must be entered before Callback is activated. If not,
the user hears a busy tone.
If a user queues a call and then uses Forward, Remote Call Forward, or
Follow Me, the call does not ring back at the destination extension or
telephone number; the callback call returns only to the forwarding
telephone.