This document provides guidance on developing an effective telephone voice. It emphasizes using a pleasant tone through relaxed vocal chords, maintaining an audible but not too loud or soft volume, and using a lower pitch to sound confident and in control. Other tips include speaking clearly with good pronunciation, being intelligible through interesting content, and varying speech speed, pitch, tone, and volume to engage listeners and avoid monotony. Proper posture, smiling, and limiting fillers and interruptions can also improve one's telephone voice.