System administrator, who might prevent the user from changing the destination number
User
To use the autodial key, typically the user selects a line appearance, receives dial tone, and presses the autodial button. At that time, the call server processes the digits to route the call.
A subset of users may use the autodial button for different purposes, though. Certain users program the autodial button to send digits when prompted for some operation. As an example, the system may have some routes classified as “expensive”, and the user needs to enter an authorization code.
