Cause Source Errors

The Cause Source (CS) bit supports the following cause values in Create Session Response, Modify Bearer Response, Modify Bearer Failure Indication (MBFI), or Delete Bearer Failure Indication (DBFI).

CS Bit Causes

Cause Value

Scenario

Context Not Found

When the subscriber is not present in SMF and receives Create Session Response with handover indication, the SMF sends this cause.

Missing Or Unknown APN

When Create Session Response receives missing or unknown APN, the SMF sends this cause.

DBFI with Context Not Found

When the subscriber is not present in SMF and receives Delete Bearer Command, the SMF sends this cause.

Delete Session Response with Context Not Found

When the subscriber is not present in SMF and receives a Delete Session Request in old TEID, the SMF sends this cause.