ISDN location verification can prevent the misuse of a router. Each time it is switched on, the router carries out a check by making an ISDN telephone call to itself to ensure that it is installed at the intended location. Only after successful location verification is the router module activated.
Prerequisites for successful ISDN location verification:
- The device must be reachable from the public ISDN telephone network.
- The device needs two free B channels for the duration of the check. If just one channel is free, e.g. one channel at a point-to-multipoint connection with two B channels is being used for a telephone call, then the device cannot make a call to itself via ISDN.
