Yes! I rely on an excellent team of doulas in Atlanta to provide back-up support for me if two clients need assistance at the same time. All are certified, experienced doulas and are part of my group, The Happiest Doulas.
Although this hasn't been necessary to date, as a fail-safe, my clients are provided with the contact information of my back-up doula team in case I cannot be reached during a labor. I want to be sure that all women who want doula support receive it during childbirth.