Offline Charging System is used in Next Generation Service Delivery Networks for the charging of service in non Real time fashion.

AdvOSS offers the IMS Offline Charging System based on 3GPP specifications for providing offline charging converged communication services.
IMS Offline Charging System is built with a fully modular approach therefore is easily extensible. IMS Offline Charging System has been implemented using the high performance asynchronous application development framework called AMPS (Asynchronous Middleware for Protocol Servers). As IMS Offline Charging system is based on Diameter and 3GPP specifications, integrating it with any third party software that supports above standards is quite straightforward.