Sentinel Express is both a services platform and a services framework.
As a services platform, Sentinel Express provides a real-time session control of TDM, IMS, and Diameter sessions. It is built on the Rhino TAS platform.
You can also view Sentinel Express as a flexible and powerful services framework. The Sentinel Software Development Kit (SDK) will let you build your own custom Sentinel.
Documentation for other versions of Sentinel Express is also available.