I am enquiring as what the problem is with our panasonic KX-T7630. We are a business who has 5 of these phones with 3 seperate lines. As of yesterday our main line was not recieving any calls although the callers have said that it was ringing out on there end. For abit over a week before the line has been crackly.I rang telstra who ran a line test on that number and said there was nothing wrong but it is to do panasonic and something internally. As I am no expert I was wondering what is the problem and what is to be done?