Error Handling on AUSF Interface

AUSF Interface Errors
Application Error

Description

NAS Cause Code

Response to UE

403 Forbidden

SERVING_NETWORK_

NOT_AUTHORIZED

The serving network is not authorized. For example, serving PLMN

#11, PLMN not allowed

Registration Reject

AUTHENTICATION_

REJECTED

The user cannot be authenticated with this authentication method. For example, only SIM data available

#3, Illegal UE

Registration Reject

INVALID_HN_PUBLIC_

KEY_IDENTIFIER

Invalid HN public key identifier received.

#3, Illegal UE

Registration Reject

INVALID_SCHEME_

OUTPUT

SUCI cannot be decrypted with received data.

#3, Illegal UE

Registration Reject

404 Not Found

CONTEXT_NOT_FOUND

The AUSF cannot found the resource corresponding to the URI provided by the NF Service Consumer.

#7, 5GS services not allowed

Registration Reject

USER_NOT_FOUND

The user does not exist in the HPLMN.

#7, 5GS services not allowed

Registration Reject

501 Not implemented

UNSUPPORTED_

PROTECTION_SCHEME

The received protection scheme is not supported by HPLMN.

#11, PLMN not allowed

Registration Reject

The following errors are temporary. The AMF rejects the request from the UE so that it can try another network.

Temporary Errors
AUSF Application Error

HTTP Status Code

Description

UPSTREAM_SERVER_ERROR

504 Gateway Timeout

Registration Reject with cause #15, No suitable cells in tracking area

NETWORK_FAILURE

504 Gateway Timeout

Registration Reject with cause #15, No suitable cells in tracking area

AV_GENERATION_

PROBLEM

500 Internal Server Error

Registration Reject with cause #15, No suitable cells in tracking area