MERLIN LEGEND Communications System Release 6.1
Feature Reference
555-661-110
Issue 1
August 1998
Features
Page 104Callback
■ Selective. Callback is activated only when a caller chooses it by dialing a
feature code or, on multiline telephones, by pressing a programmed
Selective Callback button. On MLX display telephones, a caller can also
select the feature from the display.
When Automatic Callback is on and a caller reaches a busy extension or pool, he
or she hears the queuing tone (five short beeps) instead of the busy tone. The
tone indicates that the system is putting the call into the callback queue.
When a caller wishes to use Selective Callback for a call and reaches a busy
extension, he or she must activate Callback while listening to the busy signal. If
the caller tries to make a call by using a pool in which all lines/trunks are busy, he
or she hears a fast busy signal immediately after dialing the pool dial-out code.
After activating Callback, the caller receives dial tone; after all digits are dialed,
the caller hears the queuing tone and the call is added to the callback queue.
With both types of Callback, a caller can either stay on the line until the call is
completed or hang up.
■ If the caller stays on the line, the red and green LEDs next to the line button
are lit. When the busy extension or pool is available, the caller hears the
out-of-queue tone (three short beeps) and the call is completed
automatically.
■ If the caller hangs up, the green LED next to the line button flashes,
indicating that the button is being held for the queued call. When the busy
extension or pool is available, the caller hears a priority ring (four bursts of
ring on an MLX telephone and three bursts of ring on an analog multiline or
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.
For inside and outside calls, the caller hears ringback when the extension is
available, but the system does not make the call until the caller picks up.
Considerations and Constraints 3
Callback cannot be used for personal lines assigned to buttons on a telephone.
See “Line Request” on page 413
for additional information. If more than one call is
waiting for the same extension or pool, the call that has been queued 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
receive a busy signal.
No more than 40 dialed digits can be included in a queued call.
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