Mitel SX-200 Documentation page 280

REMOTE SYSTEM RESET - PROTECTION OVERRIDE
Description
This system option allows the PBX system to be reset from the test
line or console without setting the thumbwheel switches on the Tone
Control card to YYXY (see also Reset the System).
Conditions
None
Programming
Select System Option 166 (Remote System Reset - Protection
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Override).
An access code (i.e., 555) must be assigned to Feature Number
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19 (Maintenance Function).
The thumbwheel switches on the Tone Control card must be set
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to YYXY, where: Y is any digit 0 to 9, and X is any digit except 7.
Operation
(Where 555 is the Maintenance Function Access code).
The console or test line dials 555 + 6 - system resets.
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SECTION MITL91 OS/91 10-096-l OS-NA
Page 225