3GPP Scout / Reference / ESM causes / ESM cause #55

TS 24.301ESM cause

ESM cause #55: Multiple PDN connections for a given APN not allowed

TS 24.301 V20.1.0Clause 9.9.4.4Value 55 (bits 0011 0111)Checked 2026-10-15

In plain words

The network uses this cause to indicate that the PDN connectivity procedure was rejected because multiple PDN connections for a given APN are not allowed.

Our summary of the spec text quoted below.

What the spec says

Name in the cause table

Multiple PDN connections for a given APN not allowed

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 is used by the network to indicate that the PDN connectivity procedure was rejected due to multiple PDN connections for a given APN are not allowed.

Source: 3GPP TS 24.301 V20.1.0, clause B.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.

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 line was 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.