Study on architecture of IP Multimedia Subsystem (IMS) based Customized Alerting Tone (CAT)
This study intends to investigate the architectural impacts on and potential enhancements to IMS specifications to meet the normative requirements for CAT in IMS domain as specified in TS 22.182 [2]:
- Architecture and procedures to support basic call scenarios for CAT in IMS domain;
- Interaction with other service, e.g. IMS Multimedia telephony supplementary services;
- Service provision for roaming subscribers;
- Interworking between IMS CAT and CS CAT in TR 29.882 [3].
In the end, this study will provide conclusions with respects to what further specification work is required in order to fulfil the requirements for the CAT in IMS domain.