MERLIN LEGEND Communications System Release 5.0
Feature Reference
555-650-110
Issue 1
June 1997
Features
Page 103
Callback
Pools
In Hybrid/PBX mode, Callback can be used to complete calls to an
outside number only when all lines/trunks in the pool are busy.
Primary Rate Interface
(PRI) and T1
Callback cannot be used to request a busy PRI line assigned as a
personal line, but it can be used to request a line from a pool of PRI lines.
An idle PRI line is not considered an available pool member unless a
check determines that it is associated with an available B-channel. Even if
a B-channel is available when the pool selects a line for a queued call,
there may be none available when it is time to send a setup message to
the network. Or, after the setup message is sent, the network may
determine that the B-channel proposed by the system is not available. In
either case, the call fails and a fast busy tone is applied.
Some applications (such as video systems) that use data lines may work
improperly when releasing data facilities requested by Callback.
Recall/Timed Flash
If Recall is used while a user is off hook with a queued callback request,
the call is disconnected and the user hears dial tone.
Reminder Service
Reminder calls cannot be queued by using Callback.
Remote Access
Remote access users can use Callback if the system is programmed for
remote access Callback (Autoqueuing). The user cannot hang up but
must wait on the line until the extension or pool is available. The caller
hears Music On Hold if it is programmed.
SMDR
SMDR begins measuring the duration of a callback call when the call is
completed.
Speed Dial
When a Stop character is programmed as part of a Speed Dial number,
stay on the line, wait for the callback call, and then reactivate Speed Dial.
This signals the system to continue dialing the digits following the Stop
character.
System Access/
Intercom Buttons
Callback can be used on SA and ICOM buttons. When Callback is used
on an SA button, the call rings and the green LED next to the button
flashes only at the telephone that originated Callback. If a user other than
the person originating the callback call selects the flashing SA button with
the callback call and lifts the handset, he or she hears the queuing tone
and the green LED on the originator’s telephone goes from flashing to
steady. If the second person hangs up, the green LED on the originator’s
telephone goes back to flashing and the system directs the callback call
to the originator. If the second person stays on the line, the system directs
the call to the second person and not to the callback originator.
Selective Callback can be used from an SA or Shared SA button. The
green LED next to the button at the telephone that originated Callback
and all those next to other related SA and SSA buttons remain on.
