Mitel SX-200 Documentation page 260

OUTGOING TRUNK CALLBACK
Description
Outgoing Trunk Callback allows the Attendant or an extension user
who receives a busy signal after dialing a trunk group access code, to
have the call completed when a trunk in the called trunk group be-
comes free. When a trunk becomes free, the system seizes the re-
quired trunk and rings the originating party (see Automatic Callback).
Conditions
A callback will always ring the originating extension; Call For-
warding has no effect.
Up to 30 callback requests may be active within the system at
any time.
If the trunk group is accessed before the callback is honoured,
the callback will be cancelled automatically.
Duplicate callback requests are ignored. (The original callback
request is cancelled.)
The Callback - Busy access code must be dialed within 10
seconds of receiving busy tone.
If a callback is not answered by the originating extension within
six rings, it is automatically cancelled.
If the called trunk group becomes busy before the originating
party answers the callback, the originating party will hear busy
tone and may dial the callback code again.
The Attendant may cancel all callback requests by dialing %I#
and pressing the RELEASE button.
All callback requests are lost after recovery from a power failure.
Attempting to set up a callback on an identified trunk group will
result in reorder tone being returned.
Callbacks are not effective if Account Codes are used.
Programming
Select System Option= (Outgoing Trunk Callback).
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Select COS Option Number 33 [Automatic Callback).
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Assign an access code to Feature Number 23 (Callback - Busy).
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Assign an access code to Feature Number 18 (Attendant
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tion), usually % as indicated under Operation.
Operation
To activate Callback:
Dial the trunk group access code - busy tone is returned.
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Dial the Callback - Busy code - dial tone is returned or the
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Attendant presses the CALLBACK button, then the RELEASE but-
ton.
Replace handset.
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To answer a Trunk Callback at the Attendant Console:
SECTION MITL9105/9110-096-105-NA
Func-
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