It will work on 4.0+ so it will work on the versions i recommended.
from the docs.
Flash Hook
Sends a hook flash signal to the currently connected line if that line is an analog line. For IP Office 4.0+ this can be used for a Centrex Transfer for calls on lines from a Centrex service provider.
• Action Data: Optional.
Normally this field is left blank. For IP Office 4.0+ it can contain the destination number for a Centrex Transfer for external calls on a line from a Centrex service provider.
• Default Label: Flash.
• Toggles: .
• Status Indication: .
• User Admin: .
• Phone Support
Note that support for particular phone models is also dependant on the IP Office software level.
• Analog:
• 1600 Series: *
• 20 Series:
• 2400 Series:
• 3600 Series:
• 3700 Series:
• 3810:
• 4400 Series:
• 5400 Series:
• 4600 Series: *
• 5600 Series: *
• 6400 Series:
• 9040:
• T3/T3 IP Series:
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It works! Now if only I could remember what I did...
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