NAS 5G UE to AMF 3GPP TS 24.501

5G NAS - Network Slice-Specific Authentication Complete

Network Slice-Specific Authentication Complete is the UE's response carrying the slice-specific authentication reply for the requested S-NSSAI.

Message Fact Sheet

Protocol	nas	Network	5g
Spec	3GPP TS 24.501	Spec Section	8.2.32
Direction	UE to AMF	Message Type	5GMM signaling

Full message name	5G NAS - Network Slice-Specific Authentication Complete
Protocol	NAS
Technology	5G
Direction	UE to AMF
Interface	N1
Signaling bearer / channel	NAS signaling / Dedicated NAS message
Typical trigger	Sent after the UE receives Network Slice-Specific Authentication Command.
Main purpose	Lets the UE answer the network's slice-specific authentication challenge.
Main specification	3GPP TS 24.501, 8.2.32
Release added	Release 17
Procedures where used	Slice Authentication

What is Network Slice-Specific Authentication Complete in simple terms?

Network Slice-Specific Authentication Complete is the UE's response carrying the slice-specific authentication reply for the requested S-NSSAI.

Lets the UE answer the network's slice-specific authentication challenge.

Why this message matters

This message is the UE answering the network's extra authentication challenge for a specific slice.

Where this message appears in the call flow

Slice Authentication

Call flow position: UE response within the slice-specific authentication exchange.

Typical state: UE is answering the slice-specific challenge for a requested S-NSSAI.

Preconditions:

The UE received Network Slice-Specific Authentication Command.

Next likely message: Network Slice-Specific Authentication Result

Call flow position

Previous message(s): Network Slice-Specific Authentication Command

Next message(s): Network Slice-Specific Authentication Result

Message direction and transport

Sender and receiver: UE to AMF

Interface: N1

Domain: Core-side slicing authorization signaling

Signaling bearer: NAS signaling

Logical channel: Dedicated NAS message

Transport / encapsulation: NAS 5GS message carried end-to-end between UE and AMF

Security context: Part of the slice-specific authentication branch after basic registration context exists.

Message Structure Overview

This message is the UE-side reply in the NSSAA challenge-response pair.

ASN.1 Message Syntax for 5G NAS - Network Slice-Specific Authentication Complete

This message is not typically analyzed as ASN.1 on the wire. It is usually read as a NAS or protocol field structure instead.

This is a NAS 24.501 message used for slice-specific authentication.

5G NAS - Network Slice-Specific Authentication Complete - Example Dump

Network Slice-Specific Authentication Complete
  Extended Protocol Discriminator: 5G Mobility Management
  Security Header Type: Integrity protected and ciphered
  Message Type: Network Slice-Specific Authentication Complete
  EAP Message: Response

How to read this dump

The message is meaningful only when read together with the preceding slice-specific authentication command.

Important Information Elements

IE	Required	Description
`EAP message`	Yes	Carries the UE's response for the slice-specific authentication exchange.

Detailed field explanation

`EAP message`

Carries the UE's response for the slice-specific authentication exchange.

Presence: Required

In practice: If present, it reflects the external DN authentication result. It is worth checking when the session succeeds on NAS but service access still depends on an external authentication flow.

What to check in logs and traces

Confirm the UE answered the correct slice-specific authentication command.
Check whether the EAP response was delivered successfully.
Correlate the message with the final slice-specific result and later Allowed NSSAI.

Common Issues and Troubleshooting

The network triggers slice-specific authentication but the requested slice is never activated.

Likely cause: The UE response may be missing, invalid, or rejected in the later result.

What to inspect: Check NSSAA Complete delivery and then inspect the final result.

Next step: Correlate with rejected or missing slice authorization in the resulting context.

FAQ

What does Network Slice-Specific Authentication Complete do?

It carries the UE's response to the network's slice-specific authentication challenge.

Related message pages

Related Procedures

Slice Authentication

Related Tools

Use This Reference in Practice

Decode this message with the 3GPP Decoder, inspect the related message database, or open the matching call flow to see where this signaling step fits in the full procedure.