TAILIEUCHUNG - Signaling System No.7 Protocol Architecture And Sevices part 56

ummary This chapter focused on the key SigTran protocols and their role in a nextgeneration architecture of voice products. The SigTran work grew from a desire to decompose a traditional circuit switch into specialized components. It focused on the following two areas | ummary This chapter focused on the key SigTran protocols and their role in a nextgeneration architecture of voice products. The SigTran work grew from a desire to decompose a traditional circuit switch into specialized components. It focused on the following two areas A transport protocol that is suitable for meeting the requirements of carrying telecommunication protocols especially SS7 over a packet network. The creation of adaptation layers that support the primitives of SCN telephony signaling protocols. SCTP was developed as the new generic transport protocol. It provides performance and reliability benefits for telephony signaling transport over the UDP and TCP transport protocols. The common elements of the adaptation layers were introduced and described in some detail as were the following key adaptation layers M3UA Provides for the transport of MTP Level 3 user part signaling for example ISUP and SCCP . SUA Provides for the transport of SCCP user signaling for example TCAP . M2UA Provides for the transport of MTP Level 2 user signaling for example MTP Level 3 . M2PA Provides a means of creating an IP SS7 link by replicating MTP Level 2 and supporting the MTP Level 2 primitive boundary to MTP Level 3. IUA Provides for the transport of user signaling for example . In addition two protocols related to SigTran were introduced TALI and the early Cisco backhaul protocol stack. Finally some examples of SS7 to SIP and interworking were provided to provide a context for how SigTran protocols can be used with other VoIP protocols. 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 .

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