VoIP Cookbook: VoIP IP PBX Hardware
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If you require a phone solution for a small office with 6-16 extension lines, you would normally use a PBX (Private Branch Exchange) machine to perform switching between these extension lines and to manage outbound connectivity. But as there are greater needs to extend the number of extensions (say hundreds), you will find switching using this conventional PBX rather complicated, with cables snaking around your premise. In VoIP, this is no longer a problem, as VoIP PBX is based on Internet Protocol, a from factor making IP PBX a much more compact solution with fewer port cables to connect.