What is IMS (IP multimedia subsystem)?

IMS is used for conveying correspondence administrations based on the Internet Protocol (IP). IMS was initially planned by the wireless standards body 3rd Generation Partnership Project (3GPP), as a segment of the vision for developing versatile networks beyond GSM. IMS utilizes IETF conventions at every possible opportunity, e.g., the Session Initiation Protocol (SIP). IMS isn’t planned to normalize applications, but instead to support the access of multimedia and voice applications from wireless and wireline terminals, i.e., to make a type of fixed-mobile convergence (FMC).