Level 3 Level 2 Level 1

The following sections cover the suite of SS7 protocols identified in Figure 4-8:

Message Transfer Part (MTP) L1, L2, and L3 provide the transport protocols for all other SS7 protocols. MTP functionality includes network interface specifications, reliable transfer of information, and message handling and routing.

Signaling Connection Control Part (SCCP) provides end-to-end addressing and routing for L4 protocols such as transaction capabilities application part (TCAP).

Telephone User Part (TUP) primarily is a link-by-link signaling system used to connect telephone or speech calls as well as facsimile calls.

ISDN User Part (ISUP) is a circuit-based protocol used to establish and maintain connections for voice and data calls.

TCAP provides access to remote databases for routing information and enables features in remote network entities.

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