3GPP Scout / Reference / 5GMM causes / 5GMM causes #81 and #82

TS 24.5015GMM cause

5GMM causes #81 and #82: Selected N3IWF or TNGF not compatible with the allowed NSSAI

TS 24.501 V20.1.0Clause 9.11.3.22 valuesChecked 2026-10-15

Covers

TS 24.501 words these values in parallel, so they share this page. Each has its own section with the spec text and a plain explanation.

5GMM cause #81: Selected N3IWF is not compatible with the allowed NSSAI

Clause 9.11.3.2Value 81 (bits 0101 0001)

In plain words

The network sends this cause when the requested service cannot be provided because the selected N3IWF is not compatible with the allowed NSSAI.

Our summary of the spec text quoted below.

Name in the cause table

Selected N3IWF is not compatible with the allowed NSSAI

Source: 3GPP TS 24.501 V20.1.0, clause 9.11.3.2, table 9.11.3.2.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.

When it is used

This 5GMM cause is sent by the network to indicate that the requested service cannot be provided due to the selected N3IWF is not compatible with the allowed NSSAI.

Source: 3GPP TS 24.501 V20.1.0, clause A.3. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.

5GMM cause #82: Selected TNGF is not compatible with the allowed NSSAI

Clause 9.11.3.2Value 82 (bits 0101 0010)

In plain words

The network sends this cause when the requested service cannot be provided because the selected TNGF is not compatible with the allowed NSSAI.

Our summary of the spec text quoted below.

Name in the cause table

Selected TNGF is not compatible with the allowed NSSAI

Source: 3GPP TS 24.501 V20.1.0, clause 9.11.3.2, table 9.11.3.2.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.

When it is used

This 5GMM cause is sent by the network to indicate that the requested service cannot be provided due to the selected TNGF is not compatible with the allowed NSSAI.

Source: 3GPP TS 24.501 V20.1.0, clause A.3. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.

How this page was made

3GPP Scout built this page from TS 24.501 V20.1.0 as indexed on 2026-10-15. The quotes are copied from the spec, and code checks each one against the stored text and the 3GPP archive file before publishing. The plain-words lines were written by an AI model (GPT-6 Sol) and checked against the quotes by a second AI model from another company (Claude Opus 5.5). The official 3GPP text governs.