Schematic showing SCCP in the OSI model

The Signaling Connection Control Part (SCCP) layer provides connectionless network services and an address translation mechanism, called global title translation (GTT), capability above MTP3. A global title can translate a string of digits (e.g., a dialled 800 number, calling card number, or mobile subscriber identification number) into a destination point code and/or subsystem number. A subsystem number uniquely identifies an application at the destination signaling point. SCCP provides the transport layer for TCAP-based services within the OSI model.

The schematic on the right show how SCCP fits into the OSI model.


SCCP supports the following features:

  • Routing and translation functions.
  • Management functions.
  • Transfer of data without logical signaling connections.

The SCCP software supports two classes of service, in connectionless mode:

  • Class 0: Basic connectionless class.
  • Class 1: Sequenced connectionless class.

TelcoBridges and SCCP

TelcoBridges supports SCCP as part of its SS7 signaling stack.

Related actions

Refer to the appropriate Toolpack release: