Towards the end of the 1970s, the European Member States began to negotiate a new telecommunications policy. Numerous European directives have been issued to realize this new policy. The guidelines stipulated that national regulators should be established who would be responsible for supervising the market. OPTA was established in the Netherlands in 1997. The regulators were assigned various tasks and powers to achieve market forces. One of those tasks is dispute settlement between two telecommunication companies. This power to settle disputes is central to this investigation. Many questions arise in the literature and in practice about this dispute resolution competence. It is special that an administrative body settles a dispute between two private parties. Due to the special construction, there is a lack of clarity about the nature and contours of this authority. The special features of dispute resolution decisions are explained and elaborated in this book. For comparison, we looked at dispute resolution in Greek law.