IMS stands for IP Multimedia Subsystem. It is a new architecture based on new concepts, new technologies, new partners and ecosystem. IMS provides real-time multimedia sessions (voice session, video session , conference session, etc) and non real-time multimedia sessions (Push to talk, Presence, instant messaging) over an all-IP network. It targets convergence of services supplied by different types of networks like fixed, mobile, Internet.
The idea is to integrate mobile / fixed with internet technologies.IMS is different networks that inter operate due to the roaming agreements of any IMS provider.
IMS enables the service provider to offer
- Real-time and non real-time communication services
- Mobility of services and mobility of users
- Multiple sessions and services simultaneously over the same connection
The main concepts that have been considered in the design of IMS are explained below.
The most fundamental thing is that the client needs to have IP connectivity.(IPv6 needs to be used). Access independence is needed so that IMS services can be provided over any IP network.Ensuring the quality of services is done through a terminal negotiating its capabilities and expressing QoS requirements through a SIP set up or modification procedure. IP Policy control to ensure the authorization of the bearer traffic.Secure communication can be requested when engaging in a session and IMS assures security as the corresponding GSM / GPRS networks.Roaming facilities allow the user to enjoy the services even though he may be out of the home network.
IMS is the future for IP multimedia telephony.
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