You will have IP phones on both ends and an IP PBX to handle the call routing. As for the charges for calling a land line, that will depend entirely on where you are calling and what equipment is on the other end. For instance if you had an IP PBX in London and also one in the U.S., you could route the calls over IP to the other end and then it would be treated as local if it was, in fact, a local call at the remote end. Outside of that, it will depend entirely on your carrier and rates they charge.
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