VoxOffice

It's a complete voice communication platform delivering advanced PBX features through a suite of server and desktop application.

It is built on open standards,runs even on Linux and doesn't lock you into a hardware vendor like other PBXs.
Features:
- PBX features to meet all requirements
- Manage all voice services from one app
- Bring PBX management in house
- Rollout secure and robust PBX configurations quickly