Telephone Differences - AT&T MERLIN LEGEND System Reference Manual

Features

Telephone Differences

Queued Call Console
All Other Multiline
Telephones
Single-Line Telephones
Mode Differences
Hybrid/PBX
Key and Behind Switch
2-54 Callback
If the user hangs up, the green LED flashes next to the Intercom or System
Access button used to make the call to indicate that the call is on hold. When
the busy extension or pool is available, the user hears a priority ring (four bursts
of ring on an MLX telephone and three bursts of ring on an analog multiline
telephone and single-line telephone). If the user does not answer the Callback
call within the number of rings programmed for the system (1-6), the Callback
request is canceled.
A queued call console (QCC) system operator cannot use Callback.
On all other multiline telephones, Selective Callback is activated by pressing a
programmed Callback button or by pressing the Feature button and dialing 55.
On MLX display telephones, Selective Callback is also activated by pressing the
Feature button and selecting the feature from the display. If the user is on
another call when the system tries to callback, the user hears an abbreviated
ring.
A multiline telephone user can cancel a Callback request by pressing the
Intercom or System Access button used to make the call, lifting the handset,
pressing the Drop button, and pressing the Intercom or System Access button
again. The red and green LEDs next to the button go off, and the request is
canceled.
On single-line telephones, Selective Callback is activated by dialing #55 while
listening to the busy tone. This is an exception to only being able to activate
features while listening to internal dial tone. The user can make and receive
other calls while waiting for the call to be completed. The request remains in
queue until the single-line user who initiated the request is available.
A single-line telephone user can cancel a Callback request by lifting the handset
and dialing #*55 while listening 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 incoming outside call rings at a single-line telephone before any calls
queued for that telephone.
In the Hybrid/PBX mode, Callback can be used for both busy extensions and
outside calls on pools where all trunks are busy.
In the Key and Behind Switch modes, Callback can be used only for busy
extensions, not for outside lines.