Abstract: The comparison between theoretical and numerical solutions of the reflection/transmission problem for the acoustic plane wave incident normally on the discontinuity surface between two nonlinear lossy media is presented. Numerical calculations made under the assumption that the two media have the same impedance, allow for singling out the effect of nonlinearities in the description of the reflection and transmission phenomena, so that they agree with theoretical predictions. It is shown that theoretically obtained and numerically calculated results mutually confirm themselves.