An IP PBX is a VoIP based central telephone system mostly used by small and corporate companies. This technology is similar to traditional PBX switching system, the difference is that calls are routed through the Internet networks rather than PSTN or circuit switched network.
You may also come across a term PABX which the 'A' is short for Automatic, nowadays vendors manufacture the devices to work automatically unlike old days manually or needed an operator to switch the calls.
IP-PBX may come as VoIP hardware or software and can be programmed with soft-phone, sip phone and a VoIP gateway.
... and other VoIP applications
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There are plenty of vendors or managed IP-PBX solution providers who can meet your expectations such as:
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Hosted VoIP PBX
Related searches, keywords, tages: ivr, open source, ip pabx voip, sip trunk