good day people can someone help me the problem with this unit it has two lines one main and the other is suppose to ring if one is busy that line is not coming out of the unit or ringing to the phones the main line goes in and out - the service provider came and checked and there i a dial tone coming in what do i do from here? do i reset the unit from the memory at the ram? or do i reset it from the phones and reprogram them? is a programming issues stop the line from ringing to other phones?