The tone of your voice when leaving sales voicemails is almost as important as the actual words you say. If you obviously sound like a salesman, your message will be deleted before it even ends. You want to speak in a tone of voice thats friendly, confident, and casual—not overly excited, nervous, or desperate-sounding.
A commonly overlooked aspect of voicemail etiquette is your own mailbox greeting. A lot of us simply set it and forget it when we first get our phones, which for some of us was when we were teens, or we don’t have anything set up at all.

I take it this is a first-time prospecting scenario where you’ve tried to reach them, had to leave a voicemail and now you are trying the 2nd attempt. Hopefully, you’re using a voicemail strategy that includes sending the proper email to the prospect after the first attempt.
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.