By now, you've probably heard about IMS, the IP Multimedia Subsystem that is designed to replace the "smokestack" architecture of traditional service provider networks. IMS decouples application services from network control and network control from network transport (Figure 1). In theorv at least, the IMS architecture will In theory at least, the IMS architecture will make it easier to develop new services and will allow any service, regardless of media type, to work across any type of network, be it fixed or mobile, IP or TDM. Proponents of IMS also promise a flood of new multimedia services that will make subscribers more productive, make mobile carriers more competitive, and rescue wireline providers from the slow death of commodity bit hauling.
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