IP-based Multimedia Services (IMS) is a part of the UMTS specification (as of Release 5) that provides IP transport in the core network and the radio access network (UTRAN). IMS enables the

IP-based Multimedia Services (IMS) is a part of the UMTS specification (as of Release 5) that provides IP transport in the core network and the radio access network (UTRAN). IMS enables the convergence of data, speech, and mobile network technology over an IP–based infrastructure.