Although SIP trunking sounds a little complicated (it does if you read most websites, at least), the main thing businesses need to know is that it is a simpler configuration of their voice and data infrastructure, which is both easier and less expensive to design, operate, maintain, and upgrade. That tranaslates to substantial savings, and SIP trunks offer a quick and substantial return on investment.
http://www.ntvoiceanddata.co.uk/sip-trunking/
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