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GSM IDENTITIES

• Mobile Station ISDN Number (MSISDN)

The MSISDN is a number, which uniąuely identifies a mobile Telephone subscription in the PSTN numbering plan.

In GSM 900/1800,the MSISDN consists of a following:

MSISDN =

NDC

National mobile number

International mobile station ISDN number

• International Mobile subscriber Identity (IMSI)

The IMSI is a unique identity allocated to each subscriber. It is used for correct identification over the radio path and through GSM PLMN network. Ali network-related subscriber information is connected to the IMSI. The IMSI is stored in the SIM, in the HLR and VLR.

The IMSI consists of three parts:

IMSI = MCC+MNC+MSIN Where,

MCC=Mobile Country Codę MNC=Mobile Network Codę MISN=Mobile Station Identification Codę

• Temporary Mobile Subscriber Identity (TMSI)

The TMSI is used to protect the subscriber’s privacy on the air inerface. The TMSI has only local signification (that is, within the MSC/VLR area) and hence

Its structure can be determined by each operator. The TMSI should not consist of morę than four octets.

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