IMS explained

In the context of Next Generation Networks, the IP Multimedia Subsystem (IMS) is regarded as the standard for the architectural design. The IMS, defined by the 3rd Generation Partnership Project (3GPP) and also embraced by many other organizations (like TISPAN, CableLabs, 3GPP2, etc.), was developed to address network convergence challenges and end-user requirements. The IMS is the unified telecommunication industry approach toward an “All-IP” network architecture that merges the paradigms and technologies of the Internet with the cellular and fixed telecommunication worlds. It aims at creating a reference service delivery platform for provisioning IP multimedia services in a reliable, secure, and controllable manner and was also adopted as the basis of the Next Generation Networks (NGN) architecture specified by TISPAN (Telecoms & Internet converged Services & Protocols for Advanced Networks).

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