SS7 Protocols

The SS7 protocol stack is organized into layers, similar to the OSI model. Each layer provides specific functionalities and services to the layers above it.

The stack is divided into two main parts:

• The Message Transfer Part (MTP), which provides a reliable foundation for the transfer of signaling messages.
• The User Parts and Application Parts, which define specific signaling functions and applications.

This layered approach allows for modularity, flexibility, and interoperability in SS7 networks.

SS7 protocols interact in a hierarchical manner, with each layer providing services to the layer above it:

• MTP provides the foundation for reliable message transfer.
• SCCP builds on MTP to offer additional addressing capabilities and connection-oriented services.
• TCAP uses SCCP services to enable non-circuit related information transfer.
• Application parts like MAP utilize TCAP for specific telecommunications operations.
• ISUP works alongside these protocols to manage voice circuit connections.

This layered interaction allows for complex signaling operations while maintaining modularity and flexibility in the network.