IMS refers to internet protocol multimedia subsystem.
IMS is the telecom architecture for offering multimedia and voice servieces over ip framework.IMS is defined by 3rd generation partnership project (3GPP).IMS supports multiple access types including GSM, CDMA,WCDMA,WLAN,and other packet data applications.IMS will provide internet servieces such as web browsing, email,instant messaging and video confrencing from any location.New servieces such as WAP,MMS will be introduced at the top level ofpacket switched network.
IMS uses open standard ip protocol,hence users will be able to utilize all the servieces while roaming as well.So a multimedia seesion between two ims users, between one ims user and one internet user,between two internet users is established using same protocol.Effectively IMS provides wide range of servieces via packet and circuit switched networks.
Key thing about IMS is that it is intended as open system architecture.Some applications where IMS can be used are as follows:
1.Preseance servieces
2.Full duplex video telephony
3.Multimedia advertising
4.Video streaming
5.Web/Audio/Video confrencing
6.Push-to servieces
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