Extension 15, system has 3 lines, everything was working fine until about a week ago. calls to any of the three lines now ring as if set to immediate ring. Looking at the ext. 15 we have changed the line to no ring still rings, delayed ring still ring on first ring, removed the three lines - no ring, put them back on and set to no ring - rings immediate. This is the only active extension that is having a problem an this seems to be the only problem this extension is having. AS this customer is over an hour away I have been working with the customer over the phone. Had the customer move the phone to a different port - extension 25, they did all the programing before calling me back and are saying it is doing the same thing. Could be user error? Any Thoughts? If I can not get this resolved in the next couple days I am going to have them send me the backup card so I can test it in my office.