IMS , the revolution ahead

vision :
To make a model that separates the services offered by
fixed-line (traditional telcos),                mobile (traditional cellular),            and            converged service providers (cable companies and others who provide triple-play — voice,  video, and data — services) from the access networks used to receive those services.
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Layers :
 IMS architecture is broken into distinct layers:
Screenshot from 2013-05-16 18:37:09
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Drivers :
Revenue streams for plain vanilla voice services are sharply falling and the need of the hour is to propose smart intuitive and creative service to kep up the Telecom market alive .