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ETSI TS 123 334 Universal Mobile Telecommunications System (UMTS); LTE; IP Multimedia Subsystem (IMS) Application Level Gateway (IMS-ALG) -- IMS Access Gateway (IMS-AGW) interface: Procedures descriptions (3GPP TS 23.334 version 9.3.0 Release 9)
standard by European Telecommunications Standards Institute, 10/01/2010
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