IP Multimedia Subsystem for Next Generation Networks

With the advent of 4G mobile networks service providers are looking to migrate voice services to Voice over Internet Protocol (VoIP) for cost and revenue generating advantages. However the move to VoIP alone is not sufficient to address carrier concern for revenue loss and need to generate new revenues. As wireline voice services migrate to IP they will become part of suit of real time multimedia-oriented communication services running on IP networks that share common client-server arrangement. Such services include Instant Messaging( IM), Push-to-Talk (PTT), NetMeeting and other 4G services. To evolution of VoIP supports ability to offer several new services through a new service delivery platform known as IMS defined by 3GPP group. This paper examines the IMS delivery Architecture.