IP Multimedia Subsystem (IMS) is an architectural framework for delivering internet protocol (IP) multimedia services. On Android devices, an application leveraging this framework enables advanced communication features beyond basic calling and SMS. For instance, it allows for Rich Communication Services (RCS), which provides functionalities like enhanced messaging with read receipts, group chats, and file sharing, all integrated within the native messaging experience.
The implementation of the subsystem offers numerous advantages. It enhances user communication experience with richer features, fosters interoperability across different networks, and allows mobile carriers to provide value-added services. Historically, its adoption has been driven by the evolution of mobile communication, with a move towards data-centric services and a desire for a more integrated and versatile communication platform.