What is meant by IMSI, TMSI, IMEI and MS-ISDN? Why they are needed?

What is meant by IMSI, TMSI, IMEI and MS-ISDN? Why they are
needed?

Question Posted / deepak.prince

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What is meant by IMSI, TMSI, IMEI and MS-ISDN? Why they are needed?..

Answer / manish garg

IMSI MEANS INTERNATIONAL MOBILE SUBSCRIBER IDENTIY. IT IS
UNIQE FOR EVERY SUBSCRIBER AND IS STORED IN HLR AND IN SIM.
IT IS THE IDENTIFICATION OF THE MOBILE SUBSCRIBER.

TMSI IS TEMPORARY MOBILE SUBSCRIBER IDENTIY AND IS ALOTTED
TO SUBSCRIBER IN GSM, WHILE PAGING TMSI IS BROADCASTED
INSTEAD OF IMSI FOR SECURITY PURPOSES..

IMEI IS INTERNATIONAL MOBILE EQUIPMNT IDENTITY. IT IS UNIQE
FOR EACH MOBILE STATION.

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