Mitel SX-200 Documentation page 301

SECTION MITL91 OS/91 10-096-l OS-NA
STATION TRANSFER SECURITY
Page 246
Description
This feature is designed to prevent "lost" calls (i.e., mishandled calls). if
a trunk call is transferred to a ringing extension, and the extension
does not answer within the time-out period, this feature will route the
call to the Attendant during Day Service, or to the extension that
originally answered the call during Night Service. Also, if an extension
during transfer, hangs up before completing dialing, the call which was
held (by the original extension flashing) automatically calls back the
extension.
Conditions
Timed Recall applies only to trunk calls.
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Programming
If the recall time-out is 10 s, select System Option 125
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(Attendant-Timed Recall - Don't Answer 10 s).
If the recall time-out is 20 s, select System Option 126
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(Attendant-Timed Recall - Don't Answer 20 s).
If the recall time-out is 30 s, no System Option is selected.
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If the time-out
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(Attendant-Timed' Recall - Don't Answer 40 s).
Operation
None
is 40 s, select System Option 127