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ETSI TS 124 322
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ETSI TS 124 322 Universal Mobile Telecommunications System (UMTS); LTE; Tunnelling of IP Multimedia Subsystem (IMS) services over restrictive access networks; Stage 3 (3GPP TS 24.322 version 14.0.0 Release 14)
standard by European Telecommunications Standards Institute, 03/01/2017
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ETSI TS 124 322 specifies procedures and protocol elements for tunnelling of IMS traffic over restrictive accessnetworks, specifically procedures and protocol elements for establishing, maintaining, and sending traffic via a firewalltraversal tunnel between the UE and an enhanced firewall traversal function (EFTF) in the network. The presentdocument is applicable to UE and EFTF.The present document applies only to the case when the IMS traffic is not routed via EPC of a PLMN. Procedures fortunnelling of IMS traffic that is routed via EPC are specified in 3GPP TS 24.302 [3] annex F.