vb.net barcode generator SIP: Alternative Softswitch Architecture in Software

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SIP: Alternative Softswitch Architecture
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This chapter discussed SIP as its own softswitch architecture. Rather than be a compromise between TDM and IP networks, SIP was designed from the start as a signaling protocol for VoIP. Its architecture is more scalable, extensible, and simple. The consensus in the industry is that SIP poses a better value proposition for service providers and corporate networks than does H.323. The prospect of offering services via an SIP infrastructure that cannot be provided by TDM switches has many service providers considering SIP as an easy-to-deploy VoIP architecture solution. It should be noted here that in 1995 Microsoft introduced its Windows 95 product containing networking protocol TCP/IP. Within approximately two years, TCP/IP became the de facto networking protocol for enterprise networks as almost all corporate PCs were loaded with and networked with Windows 95. H.323 also came into prominence via its inclusion in Microsoft s NetMeeting product. Given these precedences, a strong possibility exists that the inclusion of SIP in Windows XP, due to the sheer volume of the number of PCs that will ultimately be loaded with Windows XP, could well establish SIP as the dominant signaling protocol for VoIP.
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Source: Softswitch Architecture for VoIP
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Softswitch: More Scalable Than CLASS 4 or 5
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Softswitch: More Scalable Than CLASS 4 or 5
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6
Scalability
One of the most promising aspects of softswitch architecture is that its flexibility in scaling makes so many revolutionary applications possible. Given this flexibility in scaling, it is now possible to bypass the central office. A point of presence (POP) for a long-distance company can now consist of a four-port media gateway. As addressed in 2, The Public Switched Telephone Network (PSTN), the Class 4 switch scales to approximately 100,000 ports. For mainstream service providers, the term scalability is an interrogative for how big does the product in question scale to. They have traditionally thought in terms of large, centrally located, and managed switches. A large platform often translates into a lower-cost-per-port expense for the service provider. Scalability for a softswitch is contingent on two elements: the total number of ports and the call-processing capabilities. The softswitch industry, and the media gateway industry in particular, is only recently introducing high-density gateways that compete with the Class 4 and 5 switch in terms of port density (see Figure 6-1). Scalability as regards the total number of ports is contingent upon the media gateway. In 1998, the author sold media gateways that totaled 168 ports per platform. This was the most densely populated product of its kind at the time. Racking and stacking these would not prove difficult, but
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Figure 6-1 The PSTN and the relationship of Class 4 and 5 switches with centralized Class 4 switches
Class 4 Switch
Data Network
Class 5 Switch Voice Network SS7 Class 4 Switch Class 5 Switch
TDM Circuits IP Circuits
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Softswitch: More Scalable Than CLASS 4 or 5
Softswitch: More Scalable Than CLASS 4 or 5
managing them would. Also, the real estate costs of having so many lowdensity gateways in a central office or other facility would prove prohibitively expensive. Some of today s gateways offer densities in excess of 100,000 DS0s per 7-foot rack. Some media gateways can be clustered into super nodes to achieve densities in the low hundreds of thousands of DS0s. Table 6-1 illustrates the progress in media gateway density. In the converging market, scalability in terms of high density in gateways is not a major issue. Because service providers use IP networks, which can be connected to diverse locations in North America, a high-density, centralized architecture for which the Class 4 or 5 switch was designed is not necessary. Rather, less dense media gateways distributed on an IP network are more advantageous in the converging market. This enables a service provider to enter or exit a market with less risk than they would encounter with a Class 4 or 5 switch. A Net Present Value analysis demonstrates this advantage in financial terms.
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