November 30, 2005
The IP Multimedia Subsystem
VoIP systems can be integrated with the circuit-switched networks and with cellular networks. VoIP integration with cellular networks is achieved with the help of softswitches and the idea is referred to as the IP Multimedia Subsystem (IMS). Several softswitch vendors have begun to incorporate IMS into their products.
The objective of IMS is to provide Internet connectivity to cell phone users. This opens the doors for a host of IP-dependent services such as VoIP, video-conferencing, etc. This requires that the carriers being used by two communicators be IMS-compliant. Thus, IMS opens up new opportunities for revenue for the vendors. IMS uses SIP. IETF has done valuable work in the development of IMS. For using IMS in cellular networks, the SIP servers such as registration and authentication servers have to be deployed inside the home network.
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