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Signaling System No. 7 (SS7/C7): Protocol, Architecture, and Services by Jeff Hewett, Lee Dryburgh

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Chapter 13. GSM and ANSI-41 Mobile Application Part (MAP)

In fixed-line networks, the subscriber's location is static and specified according to the numbering scheme used in the network.

In cellular telephony systems, the subscriber's location can change drastically without the system being aware—for example, the subscriber might switch his cell phone off just before boarding a plane, and then switch it back on in a new country. For incoming calls to mobile subscribers, there is no direct relationship between the subscriber's location and the cell phone number. Because the location and other information must be derived real-time before a call can be delivered to a cell phone, such mobile terminating calls require the performance of a large amount ...

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