Hello. I have been trying to find a manual for this particular system for the past couple of days. I have looked everywhere including the manuals link for the forums. Am I overlooking something? Past posts have said to search there. Ive also tried searching Nec 124i and 384i but still cant find it. Our customer has bought an old system. Its functional, but I need to program ringing assignment.(only one set rings). Please help or direct me to the proper manual. Thanks