If the sales rep is still unfamiliar with cold calling, it can be helpful to provide a quiet and low-traffic space in your office to avoid interruptions.
For
remote working sales reps this means finding a quiet place at home or in a co-working space where no other people can interrupt the SDR.
Also important: the sales rep should already use the equipment that is required to do cold calling later on in the day-to-day operations. This makes the SDR gets used in working with headsets/microphones, software, etc.
After the first mock up calls are made, and the sales rep could get familiar with cold calling or the specific task, the environment can be changed. This means the salesperson can be in the office where other SDRs are and where the sales calls are usually conducted.