Network LayerMTP3

The network layer of the SS7 protocol is called MTP3. The MTP3 protocol routes SS7 messages and relies on the delivery of messages from MTP2. MTP3 also uses primitives to communicate to L4 protocols such as SCCP, ISUP, TUP, and TCAP as well as to pass and receive information from MTP2.

The MTP3 protocol is divided into two main functions:

• Signaling Message Handling (SMH)—Routes SS7 messages during normal conditions.

• SNM—Reroutes link traffic during network failure conditions.

This section first analyzes the message format of the MTP3 layer and then studies the SMH and SNM processes and functions.

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