Your voice is a powerful tool to use positive body language over the phone, as it can convey your emotions, intentions, and personality. Be aware of how you use your pitch, tone, volume, speed, pause, and emphasis. Aim for a natural and comfortable pitch that suits your voice and your caller. Your tone should be friendly, respectful, and confident. Speak at a volume that is audible and appropriate for your caller and environment. Speak at a speed that is easy to follow, not rushed or dragged. Pay attention to the pauses between your words and sentences; they should be natural, not awkward or abrupt. Put stress on relevant words or phrases, not random or exaggerated ones. By paying attention to these aspects of your voice and other positive body language cues such as smile, gestures, posture, and eye contact, you can communicate more effectively with customers and build trust.