*Use the word “with” instead of “to.” It sounds more positive. You want to talk “with” the person, not give them a “talking to.” It’s a subtle difference, yet it keeps the message positive.
Think through what you are going to say before you place the call. When men hear the beep, they often freeze up and forget what they wanted to say. If you want to be the go-to guy at work, then you have to exhibit competence on all levels. Don’t spoil your confident image by hemming and hawing and filling your messages with “uhhhhs,” and “ummmms.” If it’s a really important call, consider writing out what you want to say beforehand. If the person picks up, great, you now have some notes to remember what you wanted to talk about. If they don’t answer, you can leave a clear and concise message.

Your phone number is the last thing you should say on a voicemail. Say it once, slowly, and make sure to repeat it again. This has two benefits: First, it makes your phone number the last thing they hear, which encourages an immediate call back. And, second, in the age of voicemail dictation, it ensures your phone number appears clearly at the end of the message text. It will be hyperlinked and easy to push for a quick reply from your prospect.
A sales voicemail can't do too much for you if there's no room for any sort of progression. If you just give an explanation of your offering's benefits without establishing what that prospect should do or can expect next, you might close the door on a sale — straight off the bat.