Internet Protocol (IP) and Asynchronous Transfer Mode (ATM) are two switching technologies that are being used (or proposed) for large-scale integrated services networks. Integrated services networks are designed to support real time services, such as telephony as well as data services. Both technologies have the potential to radically change the economics and operations of telephone services. In addition, engineers have developed more e cient approaches than simple over-engineering to supporting the quality requirements of real time services (such as voice). In this paper, we will perform cost-bene t (tradeo ) study of guaranteeing the voice quality of packet telephony of various possible QoS-support approaches (IP/over-engineering, IP/prioritization, IP/RSVP, ATM-CBR, ATM-VBR). We will focus this application on integrated services networks. As with our previous work [19], we will use a simulation model to engineer a large scale network and will then analyze the switching and trunking costs. We will compare the costs of the di erent approaches needed to meet a prespeci ed QoS requirement.
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