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1 Introduction 3 1.1 Introduction.............................. 3 1.2 Performance study of Internet traffic over mobile networks.... 4 1.3 The need of a realistic testbed for repeatable testing....... 4 1.4 Voice calls over LTE: a regular data service, the same quality as before................................. 6 1.4. 1 Some considerations about the transport of VoIP over LTE 7 iii