An IP PBX is a private branch exchange is a telephone switching system that switches calls between VoIP users on local lines. It can also switch calls between VoIP user and traditional telephone user. It is a unified communication system or a business phone system which act as a central switching system for phone calls within a business.
The IP/ PBX includes a VoIP Gateway which has the directory of all phones/users and their corresponding SIP address and thus it helps in connecting an internal call or route the external call via VoIP gateway to destination.
Here we discuss some of the features of IP/PBX which are included: