Name in the cause table
Invalid mandatory information
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.
3GPP Scout / Reference / 5GMM causes / Causes #96, #98 and #100 in 5GMM and 5GSM
TS 24.5015GMM cause5GSM cause
Causes #96, #98 and #100 in 5GMM and 5GSM: Errors in a received message
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 #96: Invalid mandatory information
In plain words
This cause indicates that the equipment sending it has received a message with a non-semantical mandatory IE error.
Our summary of the spec text quoted below.
When it is used
This cause 5GMM indicates that the equipment sending this 5GMM cause has received a message with a non-semantical mandatory IE error.
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 #96: Invalid mandatory information
In plain words
The equipment sending this cause has received a message with a non-semantical mandatory IE error.
Our summary of the spec text quoted below.
Name in the cause table
Invalid mandatory information
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 the equipment sending this 5GSM cause has received a message with a non-semantical mandatory IE error.
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.
5GMM cause #98: Message type not compatible with the protocol state
In plain words
This cause indicates that the equipment sending it has received a message not compatible with the protocol state.
Our summary of the spec text quoted below.
Name in the cause table
Message type 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 the equipment sending this 5GMM cause has received a message not compatible 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 #98: Message type not compatible with the protocol state
In plain words
The equipment sending this cause has received a message incompatible with the protocol state.
Our summary of the spec text quoted below.
Name in the cause table
Message type 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 the equipment sending this 5GSM cause has received a message not compatible 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.
5GMM cause #100: Conditional IE error
In plain words
This cause indicates that the equipment sending it has received a message with conditional IE errors.
Our summary of the spec text quoted below.
Name in the cause table
Conditional IE error
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 the equipment sending this cause has received a message with conditional IE errors.
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 #100: Conditional IE error
In plain words
The equipment sending this cause has received a message with conditional IE errors.
Our summary of the spec text quoted below.
Name in the cause table
Conditional IE error
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 the equipment sending this cause has received a message with conditional IE errors.
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.
- EMM cause #96 (TS 24.301)
- ESM cause #96 (TS 24.301)
- EMM cause #98 (TS 24.301)
- ESM cause #98 (TS 24.301)
- EMM cause #100 (TS 24.301)
- ESM cause #100 (TS 24.301)
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.