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interface, nor does it adequately support congestion control. This is not generally a problem for private networks, but it does become problematic for service providers who wish to interconnect PSTNs and provide national service among a cluster of providers. As a result of this, many service providers have chosen to deploy SIP instead of H.323 in their national networks. SIP is designed to establish peer-to-peer sessions between Internet routers. The protocol defines a variety of server types, including feature servers, registration servers, and redirect servers. SIP supports fully distributed services that reside in the actual user devices and, because it is based on existing IETF protocols, provides a seamless integration path for voice/data integration. Ultimately, telecommunications, like any industry, revolves around profitability. Any protocol that allows new services to be deployed inexpensively and quickly immediately catches the eye of service providers. Like TCP/IP, SIP provides an open architecture that can be used by any vendor to develop products, thus ensuring multivendor interoperability. And because SIP has been adopted by such powerhouses as Lucent, Nortel, Cisco, Ericsson, and 3Com, and is designed for use in large carrier networks with potentially millions of ports, its success is reasonably assured. Originally, H.323 was to be the protocol of choice to make this possible. And while H.323 is clearly a capable suite of protocols and is indeed quite good for VoIP services that derive from ISDN implementations, it is still incomplete and is quite complex. As a result, it has been relegated to use as a video-control protocol and for some gatekeeper-to-gatekeeper communications functions. The intense interest in moving voice to an IP infrastructure is driven by simple and understandable factors: cost of service and enhanced flexibility. However, in keeping with the Jurassic Park Effect (Just because you can, doesn t necessarily mean you should), it is critical to understand the differences that exist between simple voice and full-blown telephony with its many enhanced features. It is the feature set that gives voice its range of capability; a typical local switch such as Lucent Technologies 5ESS offers more than 3,000 features, and more will certainly follow. Of course, these features and services are possible because of the protocols that have been developed to provide them across an IP infrastructure.
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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Many of the protocols that are guiding the successful development of VoIP efforts today stem from work performed early on by Level 3 and Telcordia, which together founded an organization called the International SoftSwitch Consortium. In 1998, Level 3 brought together a collection of vendors that collaboratively developed and released the Internet Protocol Device Control (IPDC). At the same time, Telcordia created and released the Simple Gateway Control Protocol (SGCP). The two were later merged to form the Media Gateway Control Protocol (MGCP), discussed in detail in RFC 2705. MGCP allows a network device responsible for establishing calls to control the devices that actually perform IP voice streaming. It permits software call agents and media gateway controllers to control streaming media gateways at the edge of the network. These gateways can be cable modems, set top boxes, PBXs, VTOA gateways, and VoIP gateways. Under this design, the gateways manage the circuit-switch-to-IP voice conversion, while the agents manage signaling and call processing. MGCP makes the assumption that call control in the network is software based, resident in external, intelligent devices that perform all callcontrol functions. It also makes the assumption that these devices will communicate with one another in a primary-secondary arrangement, under which the call agents send instructions to the gateways for execution. See Table 3-1 for a list of requirements for multimedia applications. Table 3-1 Multimedia Application Requirements
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