I have a stutter and I’m worried to start answering phone calls at my new job

I have a stutter and I’m worried to start answering phone calls at my new job I started as a bank teller, and all my online training is done. Which means I get to be on the teller lines being trained hands on now. I’ve been able to mask and hide my stutter and I don’t think they know I have a stutter. It really only gets uncomfortable when I’m nervous. But as a teller I have to answer phone calls and say the set script they have for phone calls, which is making my anxiety go crazy. I’m so worried I’m gonna mess up every phone call and idk what to do. Should I just warn them I’m nervous about phone calls?