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ETSI TR 123 981
M00000477
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ETSI TR 123 981 Universal Mobile Telecommunications System (UMTS); Interworking aspects and migration scenarios for IPv4-based IP Multimedia Subsystem (IMS) implementations (3GPP TR 23.981 version 6.4.0 Release 6)
standard by European Telecommunications Standards Institute, 09/01/2005
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