It is very important to be open about your stutter. Don't hide it and don't be ashamed of it. It's a part of who you are! You should always tell your employer that you stutter and if you live in the USA having a stutter qualifies as a disability so be sure to mark yourself as disabled on any paper work you fill out. When you take calls, tell the person you are speaking to that you stutter and most of the time the response will be good. Try to laugh at yourself and relax :) I'm sure you will be just fine!