Transaction Capabilities Application Part

The Transaction Capabilities Application Part (TCAP) is a system used in telephone networks that lets different parts of the network communicate with each other without needing a direct call. It helps handle things like checking account information, enabling mobile roaming, and running advanced wireless services.

It is defined in ITU-T recommendations Q.771-Q.775 or ANSI T1.114 as a protocol for Signalling System 7 networks. Its primary purpose is to facilitate multiple concurrent dialogs between the same sub-systems on the same machines, using Transaction IDs to differentiate these, similar to the way TCP ports facilitate multiplexing connections between the same IP addresses on the Internet.

TCAP uses ASN.1 BER encoding, as well as the protocols it encapsulates, namely MAP in mobile phone networks or INAP in Intelligent Networks.

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