> For the complete documentation index, see [llms.txt](https://prosbcdocs.telcobridges.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://prosbcdocs.telcobridges.com/telecom-references/protocols/creating-new-transaction.md).

# 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 the transaction and dialogue portions are sent.

Each transaction must be uniquely identified. The transaction identifier of an outgoing transaction is determined by the TCAP service user and must be within the range 0x80000000 to 0xFFFFFFFF. The transaction identifier of an incoming transaction is determined by the 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 component 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.


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