All calls are answered by auto attendant. When you call the main number the aa answers, when you dial extension 17 sometimes it goes to 17 and sometimes it goes to 18. The trouble is not consistent. At first I thought someone was just dialing the wrong number but I was able to duplicate the problem. I made 3 test calls all was good the 4th went to ext 18. Reset the switch and v-mail. Made 18 test calls all was good the 19th went to ext 18. Made 5 test calls the 6th went to ext 18 etc.