AT&T MERLIN LEGEND Release 4.0 Feature Reference page 99

Feature Reference
Single-Line Telephones
A single-line telephone user can make and receive other calls while waiting for
the call to be completed. The request remains in the queue until the user who
initiated the request is available. Queued calls ring at a single-line telephone in
the order which they were queued.
A single-line telephone can queue only one call at a time. If a single-line
telephone user who has already queued one call tries to transfer a second call
to a busy pool, the transferred caller hears a fast busy tone. The system
considers the transfer complete, and the call is not returned to the single-line
telephone user who transferred the call.
Cancel a callback request by lifting the handset and dialing
to internal dial tone. The system sends a confirmation tone to indicate that the
request is canceled.
A single-line telephone user cannot use Callback if another call is on hold. A
waiting outside call rings at a single-line telephone before any calls queued for
that extension.
Feature Interactions
Account Code Entry
Automatic Route
Selection
Barge-In
Calling Restrictions
Call Waiting
An account code should be entered before activating Callback. If it is
not, wait until after the call is connected before entering the account
code. Account codes cannot be entered while the call is queued.
When a call is made using Automatic Route Selection (ARS) and all
possible trunk routes are busy, the call can be queued for the first route
in the pattern. However, if the Facility Restriction Level (FRL) for the
extension does not allow the call to be made over the route, the call is
not queued.
If Callback is used to request a busy extension or pool and the caller is
waiting on the line for the queued call, Barge-In cannot be used.
In Hybrid/PBX mode, a person with a restricted extension can use
Callback for a busy pool because restrictions are based on the specific
trunk being used to make the call. When a trunk in the busy pool is
available, the system checks for restrictions assigned to the extension.
If the extension is restricted, a fast busy signal indicates that the call is
not dialed.
When Automatic Callback is used to queue a call at an extension that
has Call Waiting, Callback overrides Call Waiting. The user with Call
Waiting does not hear the call-waiting tone, and the call is queued until
the extension becomes available.
When Selective Callback is used to queue a call at an extension that
has Call Waiting, the user with call waiting hears the call-waiting tone
and the call is queued until the extension becomes available.
while listening
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Callback