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Involved Databases >HLR, Home Location Register: the database of the subscribers linked to the MSC.

It contains information (location, administrative information, etc.)

>    VLR, Visitor Location Register: a database

contains information on the local subscribers.

The VLR retrieves data of new user from the HLR corresponding to its subscription area. The data is stored during the time of its presence in the area and are removed when he leaves or after a long period of inactivity (device off).

>EIR, Equipement Identity Register : a database of mobile eąuipments.

>    AuC, Autentication Center: in charge of yerifying the user identities (authentication).

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