This paper describes the outline of a database controlled telecommunications network system and analyzes its traffic handling characteristics using basic models. In this system, control is carried out by regional control centers each having a copy of the network information stored in its database. Calls are screened at the originating office to prevent those with little or no possibility of completion from entering the network, and optimum routes for those with high possibility of completion are determined using global network information stored in the database. Major shortcomings arise from the discrepancies between the actual network states and their images in the database, and from the distribution of control. Basic models paying attention to one of the transit trunk groups are used to analyze the primary performance of this system. For each model, an analysis of the trunk state probability is first made, and the result used to calculate the loss probability and ineffective connection rate. The results show that a proper reservation of trunks combined with rapid database update can yield good performance, and that delays within practical ranges are acceptable in maintaining performance in this system.