Dumb question, we have fax machines which are unrestricted on our Meridian 61C. The class of servce includes UNR. Is this the only coding necessary for these to be used for long distance calls, including international ones? Also can someone just plug in a analog phone into the jack and make a long distance call on these unrestricted sets? And if so, is there a way to prevent this? I hope this question makes some sense.