This feature sends a hook flash signal to the currently connected line if it is an analog line. Only supported for analog lines on the same system as the short code. See Centrex Transfer.
Details
Telephone Number: Optional The telephone number field can be used to set the transfer destination number for a Centrex Transfer. In this case the use of the short code Forced Account Code and Forced Authorization Code are not supported and the Line Group Id must match the outgoing line to the Centrex service provider.
Default Short Code:
Programmable Button Control: Flash
Release: 1.4+.
Example
Below is a sample short code using the Flash Hook feature.