Freely selectable PIN. This number helps to identify the transferred phone number as well as the permitted Call Through user.

Specifies after how many minutes an external Call Through call is ended by the PBX, due to security reasons.

Emergency calls cannot be made. The Call Through user hears a corresponding announcement.

This function is useful as the emergency call is issued at the location of the PBX and not at the location of the Call Through user.

Defines by selecting a rule under which conditions exchange line calls are performed.