The Diameter Routing Function and invoked DSR Applications record detailed information about each Diameter transaction - called transaction metadata. Each metadata record describes an important event in the lifetime of a Diameter transaction. Metadata appears in the Trace Transaction Record (TTR) in the order that the metadata-generating events actually occurred. Together, all of the metadata records combine to document the processing performed on the entire transaction, and can later be used to provide diagnostic information when performing troubleshooting. Metadata is recorded to a TTR for each transaction so that, even if the transaction is selected to be sent to IDIH at an Answer Troubleshooting Trigger Point (TTP-IA or TTP-EA), the metadata for all of the messages in the transaction will be present.
CPA will record the Application-specific metadata events described in Table 1.
| Event | Instance Data | When Recorded |
|---|---|---|
| SBR Query Sent |
|
When CPA retrieves an existing session binding record on the SBR. |
| SBR Response Received |
|
When CPA receives a response from SBR to a previous session binding query. |
| SBR Query Failure |
|
After any SBR Query failure other than a response timeout is encountered. |
| SBR Response Timed out |
|
When CPA times out waiting to receive a response from the SBR to a previous session binding query. |