OVERVIEW

 IP-PBX is a private branch exchange (telephone switching system within an enterprise) that switches calls between VoIP (voice over Internet Protocol or IP)

Wigwag setup and configure complete PBX in software, it is relatively inexpensive and easy to add additional functionality, such as conferencing, Interactive voice response (IVR) and many more… It runs on Linux and provides all of the features you would expect from a PBX.

Benefits:

Easier to install & manage via web-based configuration interface.

A software-based IP PBX is far less expensive than a hardware-based PBX / PABX
Choose from the many SIP based hardware phones instead of getting locked in with one vendor