I configured a dial up link with a specific phone number and it was able to dial initially but now that phone number doesn't dial or even get dial tone. I can dial it on the phone and if I change any single digit then the phone number will dial from the computer. Other dialup connections which function normally also will not even get dial tone if I change the number to this one. Somehow I've managed to set the number as one which the computer will never dial. Anyone know how to rectify this?