1. Essentials Guide
  2. Oracle USM Supporting the IMS Core
  3. IMS-AKA Support
  4. Authentication Failure
  5. Network Authentication Failure

Network Authentication Failure

The UA determines that the HN has failed authentication, it sends a REGISTER request with an empty authorization header parameter and no authentication token for synchronization (AUTS). This indicates that the MAC parameter was invalid as determined by the UA. In this case, the S-CSCF sends a 403 Forbidden message back to the UA.