Mitel SX-200 Documentation page 208

FLASH DISABLE
Description
This feature inhibits a switchhook flash from an extension. All features
using the switchhook in the selection of the feature are therefore
inhibited.
Conditions
Class-of-Service Option 46 (Flash Disable) and Class-of-Service
l
Option 62 (Flash for Attendant) are mutually exclusive.
Programming
The COS of the extension must contain Option Number 46 (Flash
l
Disable).
Operation
None
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