AT&T MERLIN LEGEND System Reference Manual page 102

Features
Callback
Extension Programming
Description
Programming Code:
Automatic Callback On:
Automatic Callback Off:
S e l e c t i v e C a l l b a c k :
F e a t u r e C o d e :
S e l e c t i v e C a l l b a c k :
Cancel Callback Request: *55 (single-line telephones only)
MLX Display Label:
Automatic Callback On:
Automatic Callback Off: Cback Auto, off [CbckA, off]
Selective Callback: Cback Sel [cbcks]
Callback provides users with an easy way to complete calls to busy extensions
and, in the Hybrid/PBX mode, to outside numbers when calls are made by using
a pool in which all trunks are busy.
The following two types of CalIback can be programmed via extension or
centralized telephone programming:
Automatic. Callback is activated automatically when the user reaches a
busy extension or when all trunks in a pool are busy.
Selective (the factory setting). Callback is activated only when a user
chooses by either dialing a feature code or, on multiline telephones, by
pressing a programmed Callback button. On an MLX display telephone, a
user can also select the feature from the display.
When Automatic Callback is programmed, and a user reaches a busy extension
or trunk pool, the user hears the queuing tone (five short beeps) instead of the
busy tone to indicate that the system is putting the call into the Callback queue.
When Selective Callback is programmed and the user reaches a busy
extension, the user must activate Callback while listening to the busy tone. If the
user tries to make a call by using a pool in which all trunks are busy, the user
hears a fast busy signal immediately after dialing the pool dial-out code. After
activating Callback and hearing the queuing tone, the user can dial the
telephone number and the call is added to the Callback queue.
With either Automatic Callback or Selective Callback, a user can either stay on
the fine until the call is completed or hang up. If the user stays on the line, the
red and green LEDs are on next to the Intercom or System Access button used
to make the call. When the busy extension or pool is available, the user hears
the dequeuing tone (three short beeps) and the call is automatically completed.
*12
**12
* 5 5
5 5
Cback Auto, on [CbckA, On]
Callback 2-53