3GPP Scout / Reference / 5GMM causes / Cause #101 in 5GMM and 5GSM

TS 24.5015GMM cause5GSM cause

Cause #101 in 5GMM and 5GSM: Message not compatible with the protocol state

TS 24.501 V20.1.0Clauses 9.11.3.2 and 9.11.4.22 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 #101: Message not compatible with the protocol state

Clause 9.11.3.2Value 101 (bits 0110 0101)

In plain words

This cause indicates that a received message is incompatible with the protocol state.

Our summary of the spec text quoted below.

Name in the cause table

Message not compatible with the protocol state

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 indicates that a message has been received which is incompatible with the protocol state.

Source: 3GPP TS 24.501 V20.1.0, clause A.4. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.

5GSM cause #101: Message not compatible with the protocol state

Clause 9.11.4.2Value 101 (bits 0110 0101)

In plain words

This cause indicates that a message incompatible with the protocol state was received.

Our summary of the spec text quoted below.

Name in the cause table

Message not compatible with the protocol state

Source: 3GPP TS 24.501 V20.1.0, clause 9.11.4.2, table 9.11.4.2.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.

When it is used

This 5GSM cause indicates that a message has been received which is incompatible with the protocol state.

Source: 3GPP TS 24.501 V20.1.0, clause B.2. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.

Same causes in EPS (TS 24.301)

TS 24.301 defines the corresponding causes for EPS. Their pages quote the EPS wording.

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.