This paper estimates reduced-form models for incumbent prices in the fixed telecommunications industry using data for European Union (EU) countries from 1998 to 2002. The regulation of fixed-line telephony has a significant impact on prices for residential consumers. Liberalization of the telecommunications industry decreased retail prices by about 8.2%. The introduction of carrier pre-selection and number portability had a negative impact on price levels. The estimation results also suggest that a 1% decrease in termination charges on the incumbent network led on average to a 0.17% decrease in the cost of usage basket for residential consumers. Furthermore, in the pricing regressions for incumbent local and national calls at peak and off-peak times interconnection charges are significant only in the estimation of national peak prices. A 1% decrease in single transit interconnection charges on the incumbent network led to a 0.31% decrease in incumbent national prices at peak times, as calculated for the average prices in the EU in 2002.