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An IP PBX or VoIP phone system replaces a traditional PBX or phone system. It gives employees mobility with a single portable extension number – no need to hand out personal phone numbers, the ability to hold audio and video conferences, call colleagues for free, and make cheap, long distance phone calls using Voice-over-Internet-Protocol (VoIP). All calls are sent via packets over a data network instead of using the traditional phone network. With the use of a VoIP gateway, you can connect existing phone lines to the IP PBX and make and receive phone calls via a regular PSTN line. Today’s VoIP services often work hand in hand with Unified Communications solutions which can be in the form of an on-premise phone system or hosted PBX. With the advances in Voice over IP technology we see today, a high speed broadband internet connection ensures a call quality which rivals that of traditional phone lines.

The IP PBX, SIP & VoIP FAQ helps answer common questions about VoIP technology, SIP, IP PBX / VoIP Phone System hardware and software, implementation and more.

Some of the most common questions about SIP are answered in this IP PBX, SIP & VoIP FAQ.

Free for up to 1 year! Select preferred deployment:


for Linux on a $200 appliance or as a VM

Get the ISO


for Windows as a VM

Download the setup file

On the cloud

In your Google, Amazon, Azure account

Take the PBX Express