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

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Chapter 7. Message Transfer Part 3 (MTP3)

Level 3 of the Message Transfer Part resides at layer 3 of the OSI model and performs the SS7 protocol's network functions. The primary purpose of this protocol level is to route messages between SS7 network nodes in a reliable manner. This responsibility is divided into two categories:

  • Signaling Message Handling (SMH)

  • Signaling Network Management (SNM)

Signaling Message Handling is concerned with routing messages to the appropriate network destination. Each node analyzes the incoming message based on its Destination Point Code (DPC) to determine whether the message is destined for that node. If the receiving node is the destination, the incoming message is delivered to the appropriate MTP3 user. If the receiving ...

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