Hi; I was just thrown a SX200 system to manage at a hotel. I'm learning it as fast as I can but have one major issue with at least three of the 160 extensions. I can dial another room from them, and can recieve calls fine but when try to "dial 9" for an outside call I don't get a dial tone. The line just seems dead. Usually. About 1 in 20 times it works. And only on these few phones. All else is fine. I changed phones so that is not the issue, Any ideas or suggestions where to look? Thanx