3GPP Scout / Reference / EMM causes / EMM cause #83

TS 24.301EMM cause

EMM cause #83: Procedure cannot be completed due to unavailable feeder link while MME is operating in S&F mode

TS 24.301 V20.1.0Clause 9.9.3.9Value 83 (bits 0101 0011)Checked 2026-10-15

In plain words

The MME sends this cause to the UE when it operates in S&F mode and cannot service a UE generated request because the feeder link is unavailable.

Our summary of the spec text quoted below.

What the spec says

Name in the cause table

Procedure cannot be completed due to unavailable feeder link while MME is operating in S&F mode

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

This EMM cause is sent to the UE if the MME is operating in S&F mode and cannot service a UE generated request due to unavailable feeder link. [...]

Source: 3GPP TS 24.301 V20.1.0, clause A.3. © 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.