Mitel SX-200 Documentation page 366

CALLBACK - BUSY
Description
Automatic Callback - Busy allows a SUPERSET 4 user, upon encoun-
tering a busy extension or Trunk Group, to have the call completed
when the extension or Trunk Group becomes idle. After the feature has
been activated, the system continuously monitors the originating ex-
tension, and the called number. When both are idle, the system rings
the originating extension, and when that extension goes off-hook, the
system rings the called extension or accesses the trunk If more than
one callback request is active on any number, the requests are queued
and serviced on a first-in, first-out basis.
Conditions
A callback always rings the originating extension; Call Forward-
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ing has no effect.
Automatic Callback - Busy may be activated on extension num-
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bers, Hunt Group access codes and Trunk Group access codes.
If the two parties involved in a callback, hold a telephone con-
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versation (not a conference) before the callback is honored, the
callback is canceled automatically.
Any callback outstanding for more than 8 hours is canceled
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automatically.
Duplicate callback requests are ignored. (The original callback
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request is canceled.)
If a callback is not answered by the originating extension within
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six rings, it is automatically canceled.
If the called party becomes busy before the originating party
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answers the callback, the originating party hears busy tone and
the callback is canceled.
Operation
To Set Up an Automatic Callback - Busy:
Dial the required extension number or trunk access code - busy
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tone is heard.
Press the CALLBACK feature button - dial tone is returned and
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the SUPERSET 4 set is available for normal use.
To Answer an Automatic Callback - Busy:
The SUPERSET 4 set rings.
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Lift the handset - either audible ringing tone is returned and the
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called number rings, or CO dial tone is heard.
If on lifting the handset, busy tone is heard, the callback has to
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be reactivated.
SECTION MITL91 OS/91 1 O-096-107-NA
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