scope:

Customized multimedia ring (CMR) is a set of services that allows subscribers to customize the media used for ring tone presentation to the called/calling party. CMR consists of the customized ring-back tone (CRBT) service and the customized ringing tone (CRT) service.

From the user point of view, subject to the media capability of the terminals, the user experience of the service is similar across various network environments, but from the service architecture perspective, each environment has its own functional models and requirements.

This Recommendation provides:

- CMR general description;

- CMR service requirements;

- CMR functional models in call server-based, IMS-based and converged network environments.