This project implements an Advance Reservation Service (ARS) that integrates the UCLP (User Controlled Lightpath Provisioning) system into the European project PHOSPHORUS IST FP6. The main goal of this service is to provide the UCLP system with the capability to make advance reservations of the network resources. In this way, UCLP will permit its users to make advance reservations and also will be a part of the PHOSPHORUS IST FP6 project. In other words, networks managed by UCLP will be able to be interconnected with other networks managed by the different systems integrated in the PHOSPHORUS IST FP6 project.