Name in the cause table
PTI mismatch
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.
3GPP Scout / Reference / 5GSM causes / 5GSM causes #47 and #81
TS 24.5015GSM cause
5GSM causes #47 and #81: PTI mismatch and Invalid PTI value
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.
5GSM cause #47: PTI mismatch
In plain words
The network or the UE sends this cause when a provided PTI does not match any PTI in use.
Our summary of the spec text quoted below.
When it is used
This 5GSM cause is used by the network or UE to indicate that the PTI provided to it does not match any PTI in use.
Source: 3GPP TS 24.501 V20.1.0, clause B.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.
5GSM cause #81: Invalid PTI value
In plain words
The network or UE sends this cause when the PTI provided to it is invalid for the specific 5GSM message.
Our summary of the spec text quoted below.
Name in the cause table
Invalid PTI value
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 is used by the network or UE to indicate that the PTI provided to it is invalid for the specific 5GSM message.
Source: 3GPP TS 24.501 V20.1.0, clause B.1. © 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.
- ESM cause #47 (TS 24.301)
- ESM cause #81 (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.