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ETSI TR 123 981
M00004772
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ETSI TR 123 981 Universal Mobile Telecommunications System (UMTS); LTE; Interworking aspects and migration scenarios for IPv4-based IP Multimedia Subsystem (IMS) implementations (3GPP TR 23.981 version 10.0.0 Release 10)
standard by European Telecommunications Standards Institute, 03/01/2011
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