Customized Ringing Signal (CRS) requirements; Stage 1
The document specifies the requirements and technical considerations for Customized Ringing Signal (CRS) service in the PS and CS domains, especially additional features for roaming and interoperability support.
This document considers voice and multi-media CRS, so the CRS user may experience favourable songs, multi-media clips or other customized CRS.
This document specifies the CRS filtering service requirements that allow the user to filter the CRS.