3CX Phone System
Get free IP PBX / SIP server software and set-up a professional phone system that allows you to create extensions, transfer calls, and extend low cost VOIP services to all users. Best of all it works via your computer network (no separate phone wiring!) and allows you to use SIP software phones on your PC or any SIP hardware phone. 3CX Phone System runs on Windows and does not require a dedicated PC. You can even attach your existing PSTN lines via a VOIP Gateway.
