I've been in the call center industry for roughly 10 years. Some of that time was as a phones agent, some of the time (and currently) as management. While in management I speak almost as much as I do when on the phones: I have to meet with my senior leadership on how we're doing, present to executive level leadership, meet with clients, etc. I recommend doing this: any time I have an interview, meet with leadership, present, whatever, I say somethin along the lines of this: "Before we begin, I'd like to let you know that I have a stutter. It can present itself at any point in the conversation for any reason or no reason at all. If I do stutter or it seems like I'm struggling on a word all I ask for is your patience while I work through it. If you have any questions after we finish up here I'm happy to answer any." I may not say exactly that every time, but the spirit is still there. It gives your audience an understanding of our impediment, and I now give almost everyone I meet a heads up about my stutter. When you know people understand, maybe not at first, it gives you confidence in your speech.