Digital cellular telecommunications system (Phase 2+); (GSM) Universal Mobile Telecommunications System (UMTS); Customized Ringing Signal (CRS) requirements; Stage 1 (V13.0.0; 3GPP TS 22.183 version 13.0.0 Release 13)
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.