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

The SCCP provides additional OSI network layer functionality and, with the MTP, provides an NSP. It uses the signaling network to transport noncircuit-related signaling, such as queries and responses between switches and telecommunications databases. SCCP provides two categories of service with two protocol classes in each. Classes 0 and 1 are within the connectionless category, and do not establish a virtual connection before transferring data. Classes 2 and 3 are within the connection-oriented category and establish a virtual (logical) connection before transferring data. SCCP provides flexible routing based on DPC, SSN, or GT, or a combination of all three. Global titles are an alias for a DPC and SSN and must be translated at nodes administered with the proper information (usually STPs). This process, which is known as GTT, frees originating nodes from having over-burdensome routing tables.

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