Appendix D. TCAP Messages and Components The tables in this appendix summarize Transaction Capabilities Application Part (TCAP) messages and components | Appendix D. TCAP Messages and Components The tables in this appendix summarize Transaction Capabilities Application Part TCAP messages and components and explain the purpose of each. For an introduction to TCAP refer to Chapter 10 Transaction Capabilities Application Part TCAP . Table D-1 shows the TCAP messages used in ITU-T networks. Table D-1. ITU TCAP Message Reference Binary Code Message Name Purpose 0 1 1 0 0 0 0 1 Unidirectional Used to send components to another TCAP user without establishing a transaction. No Transaction ID is allocated. No response is expected when this message is received. 0 1 1 0 0 0 1 0 Begin Initiates a transaction. The transaction ID is allocated and included in all messages that are associated with the transaction. A TCAP user can respond with an End or Continue message. 0 1 1 0 0 1 0 0 End Ends an existing transaction. The Transaction ID is released when this message is received. 0 1 1 0 0 1 0 1 Continue Sent when a transaction has been established and further information exchange is needed. A Transaction ID is allocated and used in all messages associated with the transaction. The Continue message includes both an Origination Transaction ID and a Destination Transaction ID. A TCAP user can respond with an End or Continue message. 0 1 1 0 0 1 1 1 Abort Indicates that an abnormal condition has occurred. The transaction is ended and all associated Transaction IDs are released. The abort might be initiated by the TCAP user U-Abort or the protocol itself P-Abort . Table D-2 shows the TCAP messages used in ANSI networks. Table D-2. TCAP Message Reference ANSI Binary Code Message Name Purpose 1 1 1 0 0 0 0 1 Unidirectional Used to send components to another TCAP user without establishing a transaction. No Transaction ID is allocated. No response is expected when this message is received. 1 1 1 0 0 0 1 0 Query With Permission Initiates a transaction and allows the receiving TCAP user to end the transaction. A Transaction ID is allocated .
