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The IP Multimedia Subsystem is an architectural framework for delivering multimedia services over an Internet Protocol (IP) network. Originally, it was specified for wireless networks, but has since evolved to incorporate fixed line access as well. It forms part of a Next Generation Network (NGN) which is defined as a packet-based network where the service functionality is independent of the underlying transport technologies. This allows new converged services to be implemented on top of an existing packet switched network. The IMS is not intended to act as a standard for services, but rather to aid the creation of new multimedia applications. As such, it has a horizontal control layer which separates the access network from the service layer.
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