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

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Chapter 15. SS7 Security and Monitoring

Signaling System No. 7 (SS7) is a castle in terms of security, although the castle walls are increasingly coming under attack. The main forces acting on the protocol to wear down its defenses are market liberalization and ever-increasing convergence.

When SS7 was designed and initially deployed, comparatively few telephone companies with well-defined network boundaries existed. That environment no longer exists because of market liberalization; there are more telephony providers than could have been imagined when SS7 was first drawn up.

The convergence of SS7 with next generation architectures such as IP networks has created the need for additional security enforcement. SS7 has relied on an isolated signaling ...

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