It depends on what you are cloning for. If you are just trying to just convince some other interactive voice response (IVR) system that you can answer the phone

It depends on what you are cloning for. If you are just trying to just convince some other interactive voice response (IVR) system that you can answer the phone as human "Hello" may be enough to get to the next menu. Don't underestimate the power of a few taped lines, especially in the world of increasing automation on every side of a phone call (and plenty of systems talking to systems with fewer and fewer humans in the loop).