My AT&T 993 and 992 2 line corded phones have a dialing problem. Sometimes when you dial a phone # and you don't dial it fast enough, it wont go thru. So you have to hang it up and hit redial. also, while dialing, you get 3/4 thru and it freezes up with a high pitch ring for about 10 seconds and won't go thru. Hang up and hit redial, it may work. Please help. I want to buy another 993 but don't want to go through the same issues.