This conference system is great! The audio quality on both ends of the call is crystal clear. There is no feedback and it is very easy to set up and use. If you have a digital phone system, you must purchase an adapter in order for that system to work with your digital phone lines. I bought Konexx Konference (http://www.amazon.com/gp/product/B00008KJ3M?psc=1&redirect=true&ref_=oh_aui_detailpage_o03_s00) which was easy to install.
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