Name in the cause table
Invalid mandatory information
Source: 3GPP TS 24.301 V20.1.0, clause 9.9.3.9, table 9.9.3.9.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
3GPP Scout / Reference / EMM causes / Causes #96, #98 and #100 in EMM and ESM
TS 24.301EMM causeESM cause
Causes #96, #98 and #100 in EMM and ESM: Errors in a received message
Covers
TS 24.301 words these values in parallel, so they share this page. Each has its own section with the spec text and a plain explanation.
EMM cause #96: Invalid mandatory information
In plain words
This cause means mandatory information is invalid.
Our summary of the spec text quoted below.
When it is used
See 3GPP TS 24.008 [13], annex H, clause H.6.1.
Source: 3GPP TS 24.301 V20.1.0, clause A.5. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
ESM 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 24.301 V20.1.0, clause 9.9.4.4, table 9.9.4.4.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
When it is used
This ESM cause indicates that the equipment sending this ESM cause has received a message with a non-semantical mandatory IE error.
Source: 3GPP TS 24.301 V20.1.0, clause B.2. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
EMM cause #98: Message type not compatible with the protocol state
In plain words
This cause means the message type is 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 24.301 V20.1.0, clause 9.9.3.9, table 9.9.3.9.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
When it is used
See 3GPP TS 24.008 [13], annex H, clause H.6.3.
Source: 3GPP TS 24.301 V20.1.0, clause A.5. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
ESM cause #98: Message type not compatible with the protocol state
In plain words
This cause indicates its sender 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 24.301 V20.1.0, clause 9.9.4.4, table 9.9.4.4.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
When it is used
This ESM cause indicates that the equipment sending this ESM cause has received a message not compatible with the protocol state.
Source: 3GPP TS 24.301 V20.1.0, clause B.2. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
EMM cause #100: Conditional IE error
In plain words
This cause means an error involving a conditional IE.
Our summary of the spec text quoted below.
Name in the cause table
Conditional IE error
Source: 3GPP TS 24.301 V20.1.0, clause 9.9.3.9, table 9.9.3.9.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
When it is used
See 3GPP TS 24.008 [13], annex H, clause H.6.5.
Source: 3GPP TS 24.301 V20.1.0, clause A.5. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
ESM cause #100: Conditional IE error
In plain words
This cause indicates its sender 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 24.301 V20.1.0, clause 9.9.4.4, table 9.9.4.4.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
When it is used
This ESM cause indicates that the equipment sending this cause has received a message with conditional IE errors.
Source: 3GPP TS 24.301 V20.1.0, clause B.2. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
Same causes in 5GS (TS 24.501)
TS 24.501 defines the corresponding causes for 5GS. Their pages quote the 5GS wording.
- 5GMM cause #96 (TS 24.501)
- 5GSM cause #96 (TS 24.501)
- 5GMM cause #98 (TS 24.501)
- 5GSM cause #98 (TS 24.501)
- 5GMM cause #100 (TS 24.501)
- 5GSM cause #100 (TS 24.501)
How this page was made
3GPP Scout built this page from TS 24.301 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.