I accidentally changed the settings for one of my extensions, and now when I press 9 I get an angry tone instead of the dial tone that I get on any of the other extensions. I tried adding the four outgoing trunks (801, 802, 803, 804) to the extension, but that didn't work. When I checked the other extensions they don't have any of the outgoing trunks listed either. What do I do to get a dial tone when I press 9 on this extension again?