In early 1980's, the unified telecommunication networks, which are called ISDN(Integrated Services Digital Networks), were proposed to integrate the separated telecommunication networks. Within ISDN, all signaling messages are carried through a common channel signaling network based on the No. 7 signaling system. The intelligent networks(IN) accommodating value-added services are implemented on the signaling networks. In this paper, we consider the No. 7 signaling networks which handle the signaling traffic of the basic ISDN calls as well as the IN calls. We model the No. 7 signaling system and utilize this simplified model for representing the intelligent networks. The performances of the intelligent networks are evaluated in terms of the processor utilizations at each network node and the end-to-end call setup delay. The performances of the intelligent networks with single service contol point(SCP) are also compared with those with distributed service control points. This study can be utilized in the design and implementation of future intelligent networks.
