Rehearse your greeting a few times before you press record. Plan your pauses and select natural places to take a breath. If you are recording directly into your phone don't hold it to your ear like you are talking on the phone. This can produce a muffled tone. Hold the phone out in front of you a few inches from your mouth for the clearest recording. This may require some trial and error. So playback your greeting and make necessary adjustments on your re-record.
Ah, the humble phone message. Thanks to texting, voice mail is becoming less common. But until it disappears altogether, it’s to your advantage to know how to leave clear messages. In fact, a phone message is sort of like a thank you note: You can earn big respect by leaving a good one… and lose points if your message is annoying or rude.

The tips outlined above will ensure you leave quality messages your prospects want to respond to. Go ahead and start implementing them. Rehearse multiple scripts and experiment with different approaches.
It's important to mention your follow-up plans in your sales voicemails. Sometimes just the knowledge that you'll call again is enough to entice a prospect to respond. Let them know that if you don't hear back from them, you'll follow up in a few days or next week.