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Specification

3GPP TS 24.322: Tunnelling of IP Multimedia Subsystem (IMS) services over restrictive access networks; Stage 3

Published 2026-10-16Updated 2026-10-16

At a glance

Title
Tunnelling of IP Multimedia Subsystem (IMS) services over restrictive access networks; Stage 3
Newest version
V19.0.0 (Rel-19)
Versions indexed
5
Newest per release
Rel-15: V15.0.0 (2018-06-21); Rel-16: V16.0.0 (2020-07-09); Rel-17: V17.0.0 (2022-04-04); Rel-18: V18.0.0 (2024-04-05); Rel-19: V19.0.0 (2025-07-01)

In plain words

TS 24.322 specifies "procedures and protocol elements for tunnelling of IMS traffic over restrictive access networks". IMS means IP Multimedia Subsystem here. The procedures establish, maintain, and send traffic via a firewall traversal tunnel between user equipment (UE) and an enhanced firewall traversal function (EFTF). The specification applies to UE and EFTF, and only when IMS traffic is not routed via the Evolved Packet Core (EPC) of a public land mobile network (PLMN). For access via restrictive non-3GPP networks, UE and EFTF shall establish the tunnel to the IMS IP network, then send IP packets using the specified transport procedure.

Source: 3GPP TS 24.322 V19.0.0, clause 1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/24_series/24.322/24322-j00.zip

Sources

  1. 3GPP TS 24.322 V19.0.0, clause 1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/24_series/24.322/24322-j00.zip
  2. 3GPP TS 24.322 V19.0.0, clause 4.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/24_series/24.322/24322-j00.zip

How this page was made

The facts box comes straight from the 3GPP TDoc list and specification archive as indexed by 3GPP Scout. An AI model (GPT-6 Luna) wrote the paragraph and named the source of each sentence. Code checked every quote word for word against the stored source text and every number against the cited source. A second AI model from another company (Claude Opus 5.5) reviewed the paragraph against the same sources. The 3GPP documents themselves govern.