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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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vice provider when the customer is purchasing the media gateway for his or her own use and spares the service provider of having to make this investment. Assuming the customer is buying and maintaining the IP phone or media gateway, it becomes infinitely simpler for the service provider in that the customer is maintaining the IP phone or media gateway. The service provider must merely maintain the softswitched network. Scaling down potentially disaggregates the PSTN for the quasimonopolistic service providers. The Internet has disaggregated a number of industries over the last few years. Examples include travel agencies, mortgage brokers, and car dealers. Telephone companies may be next on the list. Delivering voice services is no longer contingent upon being large enough to deal with the economy of scale that many argue was necessary in order to offer voice service. Entities smaller than a multibillion dollar RBOC can offer voice by taking advantage of low-density (and low-cost) media gateways working with a softswitch to provide call control and features. An example would be an ISP that installed media gateways in the calling areas it served and routed long-distance voice services via its IP services. Community communications cooperatives could install media gateways in curbside pedestals, such as those used by the incumbent phone service. This would enable subscribers their choice of the incumbent telco service via the legacy TDM infrastructure or the community coop service via the media gateway installed on the curb. This is called access switching and is a maturing subset within the softswitch industry. The scaling-down model will be most valuable in the developing world where the discretionary incomes of the majority of the population cannot support the installation of expensive, high-density Class 4 and 5 switches. Telephone service can be extended to remote villages in the form of IP phones (one IP phone for a small village, for example) or low-density gateways (four to eight ports, for example). Given the low cost of installation and the operation of low-density applications, service providers, local co-ops, or even governments can offer telephone service at prices affordable to the target populations. Finally, the last point of Christensen s definition of disruptive technology is met in that IP phones and media gateways are more convenient to use for the service provider if the customer is buying and maintaining them. The service provider is freed from the onerous expense of maintaining highdensity switches like the DMS-250 Class 4 switch, which comes with a $500,000 per year maintenance contract or a Class 5 switch at upwards of $2 million per year (depending on the size). Service providers freed of these expenses can undercut incumbent service providers who must continue to
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Softswitch: More Scalable Than CLASS 4 or 5
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maintain a legacy network of Class 4 or 5 switches. Such competition would ignite a race to the bottom in service pricing, greatly benefiting consumers and proving ruinous to incumbents operating under a cumbersome, expensive legacy paradigm. In this way, softswitch solutions that incorporate lowdensity media gateways disrupt legacy Class 4 and 5 switch vendors as well as legacy telephone service providers.
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Source: Softswitch Architecture for VoIP
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Softswitch Is Just as Reliable as Class 4/5 Switches
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Softswitch Is Just as Reliable as Class 4/5 Switches
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A recurring objection to Voice over IP (VoIP) and softswitch solutions is the perception that such a solution would not match the five 9s of reliability provided by the Class 4 and 5 switches. This chapter will set forth that a softswitch solution is just as reliable (actually available ) as the Class 4 or 5 switch, and a softswitched network is potentially more reliable than the PSTN. Much of what applies to building highly reliable carrier-grade softswitch solutions can work for enterprise-grade networks as well.
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