Auto Dial-back

A security facility designed to ensure that 'dial up' links to the organisation's communications network may only be accessed from approved/registered external phone numbers. The computer holds a list/register of user IDs and passwords together with telephone numbers. When a remote call is received from one of these users the computer checks that ID and password match and then cuts off the connection and dials back to the 'registered' telephone number held in the computer files. This system works well with fixed locations such as remote branches but may be inconvenient for staff who move around a lot. The drawbacks may be overcome by using a mobile telephone (connected to a laptop computer) as the registered dial-back - subject to the security requirements of protecting such items against theft or eavesdropping.