Comunications Manager Express (formerly know as CallManager Express or CCME) is a fully-featured VoIP PBX, and is Cisco’s offer for small to medium PBXs and key systems.
- Comunications Manager Express is implemented as a set of services that run on Cisco router platforms, concurrently with the data IOS features.
- Configuration data is kept in router configuration file.
- The administration interface is implemented mainly with command line. There an HTML/Jscript utility providing basic administration features, and an user interface on a per-user basis.
- Comunications Manager Express supports redundancy, with a secondary router of same or different capabilities
Here are some links to more information: