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GSM Addresses & Identifiers

100

This distinctively identifies a mobile station internationally

IMEI

200

This identifier is stored in the SIM card

IMSI

300

The authentic phone number of a mobile station

MSISDN

400

Interim location dependent on ISDN number, assigned to a mobile station by a regionally responsible VLA

MSRN

GSM

100

Houses the radio transceivers that define a cell and handles the radio link protocols with the mobile station 

Base Station Transceiver (BTS)

200

This is the connection between between the mobile and the MSC.

Base Station Controller (BSC)

300

Has lists stating which mobile devices can be used on a network

EIR

400

Protected database that stores a copy of the secret key stored in each subscriber's SIM card,

AuC

500

This is the central component of the network subsystem 

Mobile Services Switching Center (MSC)

600

This component permanently stores subscriber data

HLR

700

Routes calls to MSD/VLR

GMSC