TCAP Overview

Description: OpenSS7 SS7 Stack Overview.

This is the Signalling System No. 7 (SS7) Transaction Capabilities Application Part (TCAP) component of the OpenSS7 stack. This component implements the TCAP functions in a STREAMS multiplexing driver.

Originally it was believed that the TCAP component would be more properly placed in user-space; however, the current implementation implements the entire TCAP transaction handling and component handling functions in the kernel in a STREAMS multiplexing driver.

The TCAP STREAMS driver provides three user-level interfaces: the Transaction Interface (TRI), the Transaction Component Interface (TCI) and the Transport Provider Interface (TPI) with mOSI extensions.

An additional Global Title Interface (GTT) is provided to allow for Global Title Translation (GTT) under the control of a user level process or a specialized GTT module pushed on a GTT stream.

The TCAP STREAMS drivers supports I_LINK and I_PLINK of Signalling Connection Control Part (SCCP) streams providing SS7 SCCP SCCP-SAPs under the multiplexing driver.