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Some media gateway vendors have focused on ever-denser gateway switches, emulating the centralized architecture of the circuit-switched industry. What happens when a service provider must provide service in a low-density market (a small city, town, or suburb) This presents a problem when those high-density media gateways must interoperate with lowdensity gateways (residential or enterprise media gateways). The issues that prevent interoperability include the following:
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The dissimilar gateways may not share the same VoIP signaling protocol (H.323, SIP, or Media Gateway Control Protocol [MGCP]). Even where the gateways share the same signaling protocol, they may be of different vendors, which often results in incompatibility.
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As the scenarios described previously in this chapter suggest, there is no one size fits all approach for a softswtiched network. A number of vendors offer a very dense gateway packaged with a softswitch to pursue the carrier-grade market. This works for applications when it directly replaces a Class 4 or 5 switch, which is exactly what many have done to date with those high-density media gateways. A complication arises when highdensity media gateways must interoperate with low-density media
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Softswitch: More Scalable Than CLASS 4 or 5
6
gateways of dissimilar vendors and dissimilar signaling protocols (SIP versus H.323) installed at remote locations that require only a very low density media gateway (four or eight ports, for example). Far-sighted vendors of dense media gateways have partnered with vendors of low-density media gateways with extensive interoperability testing to ensure they can provide potential customers with a flexible range of media gateway densities. No vendor, not even those that claim to have end-to-end solutions, makes a line of gateways from low density (4 ports, for example) to carrier grade (100,000 ports) that is fully interoperable. It is then necessary to use a softswitch to translate between signaling protocols and dissimilar vendor platforms in order to optimize flexibility in scaling.
Conclusion
The scenarios described here involving media gateways that emphasize the value of scaling down rather than up support an emerging picture of the virtual telephone company. A virtual telephone company owns no Class 4 or 5 switches. It maintains a softswitch, an application server(s), and a billing platform. It completes calls over an IP network maintained by an IP backbone service provider. The virtual telephone company provides call control over the IP network via its softswitch. It provides services such as conferencing, call forwarding, voice mail, and so on from its application servers. Some companies are emerging that exist to provide special calling services (an example would be illuminets that provide signaling services). It should also be noted that legacy service providers that offer data services, such as AT&T and Sprint, can also benefit when their subscribers (usually corporate) take advantage of media gateways that scale down rather than up. Figure 6-3 and 6-4 provide a comparison of the port density of Class 4 switches and Class 4 replacement softswitches. In summary, softswitch solutions are just as, if not more, dense than Class 4 (Nortel s DMS-250 in this case). According to Clayton M. Christensen in The Innovator s Dilemma, disruptive technology is defined as cheaper, simpler, smaller, and more convenient. Such a definition can be used to describe a media gateway compared to a Class 4 or 5 switch. Scaling down certainly constitutes being smaller than a Class 4 or 5 switch. With IP phones coming on the market at less than $100 per handset and 4-port media gateways also at about $100, they are cheaper per port than Class 4 or 5. It becomes even cheaper for the ser-
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