The frequency-dependent impedance analysis was carried out on the (CuI)(100-x)-(Ag4P2O7)(x) (0 less than or equal to x less than or equal to 60) mixed system in the range from 1 Hz to 65.5 kHz and over the temperature range 293-393 K. The frequency-dependence of the conductivity of various compositions, explained on the basis of the Jonscher’s universal power law ascribed the high frequency dispersion to many body effects arising due to ion-ion interaction within the multiphase system and the low frequency dispersion to the electrode polarization effect. Effectively, the modulus spectra suggested a non-Debye type of relaxation process with a temperature-independent distribution of relaxation times (DRT) and the heterogeneous electrical structure of the present multiphase system.