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This chapter discusses how to deploy the multimedia subsystem (IMS) applications at different places to get maximum output. Client-side applications are deployed in user devices, possibly building on capabilities provided by standard services like 3GPP Multimedia Telephony (MMTel) and the Open Mobile Alliance (OMA) standard services such as chat, file transfer, presence, messaging, and GSMA streaming video and image transfer during a phone call. End-point services in the network are addressable by the end-user through a client application—for example, a timetable service responding by voice. Mid-point services in the network tend to be more about modifying the behavior of sessions. The client-side API will be either a native API if one is coding directly to a specific platform, or the JavaME JSR281 interface. If all one needs to support one's application is to be able to find and connect a session to another terminal equipped with one's application, then one really does not need to know anything except the client-side API. The IMS core will handle all the details around client registration, SIP signal routing, and so on so forth. |
