If you're not good on the phone, you're going to have a rough time in sales. Even outside sales reps spend a considerable amount of time on the phone with their prospects. Learning how to grab and hold someone's attention without physically being in their presence is a skill salespeople in every industry must develop and perfect.

The following infographic from The Gap Partnership covers all the elements of selling over the phone, from pre-call preparation to sales script tips. If you have a question about sales call best practices, odds are you'll find the answers here. 

When's the best time to cold call? Why should salespeople use headsets instead of hand held phones? How long does it take a person to adjust to a new voice? What should you say to end a call? If ever there was an infographic worthy of printing and tacking on your wall, this might be it.