Software PBX (Private Branch Exchange - aka Telephone Exchanges) products. The term PBX is rather archaic but is used here generically to include VoIP (Voice over Internet Protocol). Also included is hardware specifically designed to interface to virtual PBXs. The terms Virtual PBX and Software PBX can also refer to services which remove the PBX mechanism offsite, these are not covered in this category which is specifically for software which emulates a PBX and would normally be used onsite. Other related categories are Computers/Internet/Protocols/SIP and Computers/Software/Operating_Systems/Linux/Networking/VoIP
More information