How does an IP PBX/ VoIP phone system work?

How does an IP PBX/ VoIP phone system work?
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If youíre searching for a new business phone system, chances are youíve come across the terms IP PBX and VoIP, as well as plenty more acronyms that you need to understand! Keep reading to bust that jargon and discover how IP PBXís work.
What is an IP PBX?
The terms IP PBX and VoIP phone system are often used interchangeably to describe a business phone system that uses internet protocol (IP) to transmit voice. VoIP therefore simply stands for voice over internet protocol. The switchboard element of your private phone system is the PBX, which stands for private branch exchange.
An IP PBX system, like the 3CX IP PBX, is the central component of most modern VoIP phone systems. These systems consist of the IP PBX server, VOIP business phone system Doha Qatar, and optionally, a VoIP Gateway. The IP PBX server is similar to a proxy server. SIP clients, (either soft phones or hardware-based phones), register with the server, and when they wish to make phone calls they ask the IP PBX to establish the connection.
IP PBXs have a directory of all phones/users and their corresponding SIP address. This enables them to connect an internal call or route an external call via either a VoIP gateway or a VoIP service provider to the desired destination.
How does a VoIP phone system work?
At the core of your VoIP phone system is your IP PBX. The diagram below depicts the remaining components that complete your solution.
Diagram of how a VoIP Phone system works
Letís take a look at the components in more detail:
The corporate network
This is the companyís local network, through which computers running SIP clients such as the softphones (check out 3CXís web client), and IP Phones connect directly to the PBX.
The company router/firewall
The companyís router or firewall connects to the internet and from there it can connect to remote extensions. Remote extensions include personal computers running the PBXís softphones, remote IP Phones, mobile devices running the 3CX Android and iOS apps, and other PBXís connected via a bridge. The router can also connect to the PSTN network if a VOIP provider is used.
VoIP gateway
A VoIP Gateway connects the PBX directly to the PSTN network so that you can continue to make and answer incoming calls from analog phone lines. This can be useful for businesses undergoing a phased migration to VoIP.

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