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Network switching subsystem: Revision history


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  • curprev 15:2615:26, 19 July 201981.156.202.76 talk 19,081 bytes −1 You can't have two primary keys on a table by definition. The IMSI is often pre-registered before a MSISDN is actually assigned to it in the register. Since the MSISDN can therefore be NULL it would appear that IMSI is best described as a primary key and MSISDN as a unique key. undo

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