IP Multimedia Subsystem (IMS) Customized Ringing Signal (CRS); Protocol specification
The present document provides the protocol details for the Customized Ringing Signal (CRS) service in the IP Multimedia (IM) Core Network (CN) subsystem based on the requirements from 3GPP TS 22.183 [2].
The CRS service is an operator specific service by which an operator enables the subscriber to customize the media which is played to the called party as an incoming communication indication during establishment of a communication.
The present document is applicable to User Equipment (UE) and Application Servers (AS) which are intended to support the CRS service.