TCAP:Creating new transaction

The transaction initiation (request/response) message is used to create and initialize a new TCAP transaction. The new transaction instance stays active until sending the transaction and dialogue portions:

Each transaction must be uniquely identified. The transaction identifier of outgoing transaction is determined by TCAP service user and must be within the range 0x80000000 to 0xFFFFFFFF. The transaction identifier of incoming transaction is determined by TCAP layer and will always be within the range 0x00000001 to 0x7FFFFFFF.

To complete the TCAP message, components and parameters must be individually added using the transaction cottrmponent add message. Message type, called and calling addresses, quality of service, dialogue and user information, etc., must be initialized using the transaction component send message. The TCAP message assembly and transmission to the SCCP layer occurs only when the TCAP layer receives the transaction component send message.