Advance resource reservation service in packet switched networks is a complex task. The decision points to achieve such tasks include not only the start time of the requested connection, but also the instances when the new connection may overlap with other connections that are already scheduled in the system. The task complexity is more important when the admission resource control is addressed in optical networks, particularly when service durations are uncertain, priorities are provided, and contention is possible. In this paper, we study the issues of admission control, resource reservation, and delay in optical networks. A novel scheme for this purpose is devised. The main goals of our approach are to maximize user satisfaction in terms of quality of service (QoS) guarantees, service continuity, and reservation cost reduction.