I'm own a factory and the majority outgoing calls is to cell numbers. At the moment we have 2 premiecell lines and are reasonably happy with the system. A firm gave us a quote for 2 VOIP to replace the premiecell-system. The router price is about R 18000 inc and according to the person the savings on telphone bill will be 27%. Is it the way to go or are their better options available. Advice please