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We have used dielectric relaxation spectroscopy to measure frequency and temperature dependence of complexdielectric functions ε*(ω), ε*(T) of ion conductive glasses of the system CuI-CuBr-Cu2O-P2O5. The observation, analysis andinterpretation of the temperature and frequency dependences of real and imaginary part of the dielectric permittivities canreflect the basic features of the relaxation and transport processes of the mobile ions. The experimental results are analyzed,discussed and compared with both acoustic and conductivity spectra measurements.