The Extended UNIQUAC model for electrolyte systems, combined with the Soave-Redlich-Kwong equation of state is used to describe the complex vapor-liquid-solid equilibria of sulfur dioxide in electrolyte solutions. Model parameters based on 1500 experimental data points are presented. The parameters are applicable in the temperature range 0-110 degrees C, concentrations up to saturation and pressures up to 30 bar. This validity range corresponds to the experimental data used for the evaluation of parameters.