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To set up a business VoIP system, you need several components. A central device to manage the calls, the way a Private Branch Exchange (PBX) or Key System Unit (KSU) does in traditional phone systems is one of them. This can be a dedicated piece of hardware such as an IP PBX, a regular PBX that has been IP-enabled, or a server running specialized software. You will also need phones and a data network. In many cases, you may be able to use your existing digital phones and computer network, although you may need to upgrade some of your network hardware.
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