Instruction manual

Features
Considerations and Constraints
Callback cannot be used for Personal Lines assigned to buttons on a telephone
(DFTs). See Line Request for additional information. If more than one call is
waiting for the same extension or trunk pool, the call that has been in queue the
longest is connected first.
When a call is waiting in queue for an extension, no new calls are sent to the
extension until after the queued call is completed.
When the queue contains 64 calls (system limit), additional calls sent to the
queue result in a busy signal.
No more than 40 dialed digits can be included in a queued call.
Mode Differences
Hybrid/PBX Mode
Callback can be used for busy extensions and for outside calls on pools where
all trunks are busy.
Key and Behind Switch Modes
Callback can be used only for busy extensions. Line Request is used for busy
outside lines that are assigned to line buttons.
Telephone Differences
Queued Call Consoles
A QCC operator cannot use Callback.
Other Multiline Telephones
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 call back, the user hears an
abbreviated ring.
A multiline telephone user can queue more than one call to the same extension.
A multiline telephone user can cancel a Callback request by pressing the
SA/ICOM button used to make the call, lifting the handset, pressing the Drop
button, and pressing the SA/ICOM button again. The red and green LEDs next
to the button go off, and the request is canceled.
Callback 69