Signaling System No. 7 (SS7/C7) - Protocol, Architecture and Services (Full Book)
     
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Summary

Cellular networks have undergone a rapid development phase since their initial introduction in the early 1980s. Modern cellular networks are digital and use SS7 for communication between network entities. GSM is the most popular digital cellular standard. GSM management call control, subscriber mobility, and text messaging (SMS) use a SS7 subsystem known as MAP. MAP provides operations for tracking the subscriber's location to deliver a call, signal the subscriber's intention to place a call, and deliver text messages between handsets. Operations and maintenance staff also use it to change the subscriber's profile—to add or revoke services.

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