This TS provides the protocol details for the Customized Alerting Tones (CAT) service in the IP
Multimedia (IM) Core Network (CN) subsystem based on the requirements from TS 22.182
The CAT service is an operator specific service by which an operator enables the subscriber to customize the media
which is played to the calling party during alerting of the called party.
This TS is applicable to User Equipment (UE) and Application Servers (AS) which are intended to
support the CAT service.