This report analyses developments in the Dutch mass market (consumer & SOHO) for fixed telephony in the fourth quarter of 2017, and compares the findings with previous quarters. The analysis is based on Telecompaper's continuous research into the development of the Dutch communication services market. The focus is on KPN as the only national fixed network operator and the VoIP services provided by cable network operators (Ziggo, Delta en Caiway) and DSL network operators (Tele2, T-Mobile, Online.nl and others) as well as via fibre networks (KPN, Caiway, Tele2, T-Mobile, Online.nl and others).