> 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/receiving-transaction-error-indication.md).

# Receiving transaction error indication

The **transaction error indication** (event) message is used by TCAP to notify the TCAP service user of undelivered TCAP messages as well as the cause(s). This message is passed to the TCAP service user when TCAP receives a status indication from its lower layer. The **cause of status indication** from the lower layer is passed transparently to the TCAP service user. The lower layer uses the status indication message to indicate to TCAP the lower layer's inability to fulfill TCAP's transaction request (which is due to any protocol error or network error).

The transaction error contains the following parameters:

* TCAP userpart handle
* TCAP transaction identifier
* Calling address
* Called address
* ISNI parameters
* Message importance indicator
* Return cause indicator


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