Abstract
This chapter discusses the most common methods of developing voice over Internet Protocol (VoIP) architectures and the relative strengths and weaknesses of these approaches. The fundamental strengths of the Private Branch Exchanges (PBX)-based VoIP architecture are essentially the fundamental strengths of the PBX. The basic architecture used in nearly all PBX-based VoIP systems is to add some form of network interface, typically some form of Ethernet Network Interface Card. The major strength of the router-based gateway is that it is fundamentally an IP-based device. All of the functions of a router are designed to work in a packet-based environment. The strength of the PC-based architecture comes from its low-cost and highly customizable nature. Telephony Gateway is used as a generic term for a network device that takes a legacy voice link and converts it to IP for transport across the IP wireless area network. It is found that manufacturers of PBX-based VoIP offers are beginning to offer dedicated media gateways that connect back to the main PBX processor.
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