The last field in the transaction portion of the TCAP message is the -- component portion. It uses Operation Code (OpCode) 90 and contains three parameters as shown. CLASS=5 SEQUENCE=* OPTION=0 PRIORITY=0 DIAGNOSTIC=05 It acts much like the SCCP connection-oriented Connection Request and Connection Confirm messages. Therefore, this should counteract the fraud of spoofing the originating address. MAP_OPEN_REQUEST, this is the primitive used by the MAP user to start a new dialogue. From SCCP’s point of view, TCAP is merely another variable length parameter. It is only after this dialogue initiation that the sending of the message can begin.

0F 80 02 07 80 A1 09 06 07 04 00 00 01 00 0E 03 6C 17 A1 15 02 01 00 02 01 38 30 0D 80 08 82 06 The call flow steps for a TCAPsec in an SMS message flow are: As you can see, this needs a lot of interworking between operators and all operators need to deploy TCAPsec for it to be truly effective.

So TCAP is a set of communication capabilities that provide an interface between applications and a network layer service. Transaction Capabilities Application Part (TCAP) is the layer of the SS7 protocol that carries application data to be exchanged between nodes. TCAP carries information about transaction identifiers, which are kept open during the lifetime of a transaction and can be useful for keeping a transaction open. TCAP enables the deployment of advanced intelligent network services by supporting non-circuit related information exchange between signalling points using the SCCP connectionless service.

For this article, we will stick with “TCAP”. TCAP messages consist of a transaction portion and a component portion. 7 (SS7) Message Transfer Part (MTP) plus Signalling Connection Control Part (SCCP) have been considered as network layer service providers. Queries and responses sent between SSPs and SCPs are carried in TCAP messages. GLOBAL TITLE: TRANS= #17 TYPE= #09 DIGITS: 2 8 6 0 2 9 2 6 0 1 5 0 1 9 7

Therefore, a standardized dialogue handling function was created to minimize the need for creating new services and protocols to handle dialogues. The TCAP handshake is a fairly simple procedure to implement, since all the required functionalities exist in the current MAP and TCAP implementations.

A component is for operation, from the sending application that wants to invoke on remote application. Transaction Capabilities Application Part (TCAP) defines the messages and protocol used to communicate between applications (deployed as subsystems) in nodes. TCAP primitives are sent between the application and the local TCAP stack. In other words, some are only transferred inside the local machine. The TCAP message is sent as a Unidirectional Message Type without a Dialogue Portion. These components are an SS7 Security Gateway (SEG), a Security Policy Database (SPD) and a Security Association Database (SAD).



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