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The Third Generation Partnership Project (3GPP) has proposed the Long Term Evolution and System Architecture Evolution (LTE/SAE) as the next stage of technologies aimed at overcoming the limitation in the existing 2G and 3G networks while driving mobile networks towards 4G standardisation. Although a new architecture has been proposed for the LTE/SAE, however, some technologies from the existing 2G and 3G frameworks are reused to allow for smooth transition and backward compatibility. One of such technologies is the service delivery framework know as the IP Multimedia Subsystem (IMS).
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