IMS stands for Internet Multimedia Subsystems or IP Multimedia Systems
Many of us heard about VoIP calls or Video Telephony calls….how these works??
I will give alittle idea about this…
Voice over IP calls are made from 1 phone client to other by means of establishing SIP session. (Session initiation protocol). Suppose A wants to call B, then A will send a request to its local SIP proxy server which in turn forwards the request to B local proxy over internet.