VoIP PBX or IP PBX (Internet Protocol Private Branch Exchange) is a telephony system that makes use of IP data networks to facilitate telecommunication. The immediate advantage of VoIP PBX is that enterprises using it need not have to replace their existing phones or phone numbers to accommodate the new VoIP facility. A PBX Phone system connects your office user telephone extensions to the Public Switched Telephone Network or Service provider lines.
The basic architecture of an IP PBX system consists of an IP PBX server, one or more SIP phones or VoIP phones, and a VoIP gateway, as mentioned already, to connect to the existing PSTN lines (optional though). The IP PBX server functions quite similar to a proxy server. The SIP or VoIP phones, which can be either hardware phones or soft phones, has to register with the IP PBX server, and when they wish to make a call to another phone – a VoIP or SIP phone – actually a request is send to the IP PBX server to establish the connection.
The IP PBX server will have a directory of all users/phones and their respective SIP addresses, and using this info, it could connect an internal call or route an external call via a VoIP service provider or a VoIP gateway, whichever is applicable. The most important plus of VoIP PBX is that it is many times easier to install and configure than a traditional phone system. If somebody wants to connect a hardware phone to an IP PBX system, he/she can directly plug it into a standard network port (soft phones can be installed directly into the PC).
Since the calls make use of IP networks, even long distance international calls are many times cheaper. Further, since IP PBX is built on an open SIP standard, users can use any SIP software/hardware phone with virtually any SIP based PSTN Gateway, IP PBX or VoIP provider. Finally, with VoIP PBX, it facilitates hot desking and roaming, provides easy usability, and better manageability via the IP PBX Windows client. With proprietary phones, in order to implement the latter feature, it might require expensive hardware components.
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