I have recently moved to a new office which has the T7208.

This is probably not related to the phone itself but more likely related to the telephone system it connects to. You can configure an IP phone to connect to a telephone system at a external service provider but I would be surprised if their time was out by seven minutes so I'm guessing that you have an IP PBX in your office somewhere. It would have the names of the people at the different extensions. You probably have a support person who looks after your computers and operating systesms it is fairly normal in smaller offices for that person to also look after the telephones. I do this for two small businesses which have about 40 employees all togeather. Have a chat to your boss, someone should be responsabile for your phone system too. As time goes by it will just get worse and if it has a failure someone should know how it all works. Hope this hepls