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.
Sentinel Express Documentation

Sentinel Express Changelog
New features, improvements and bug fixes included in each software release.

Sentinel Express Overview and Concepts
An introduction to the features and concepts behind Sentinel Express.

Sentinel Express Administration Guide
How to install, configure and provision Sentinel Express.

Sentinel Registrar Overview and Concepts
An introduction to the third party Registrar function that is part of the enhanced SIP enhancements in Sentinel Express.

Sentinel Express API

Sentinel Express Provisioning REST API

Sentinel Express Annotations Javadoc

SLEE Annotations Javadoc

Documentation for other versions of Sentinel Express is also available.