Rehearse or write down your message before recording it. Remember that old saying “practice makes perfect?” It’s certainly true when it comes to creating an electronic greeting. The more you’ve rehearsed, the easier the message will be to restate. If you don’t have time to practice, writing down the greeting before recording it – and then reading it aloud from the paper – may help you stay focused on the correct wording.
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.

It might be a straightforward approach, but it's not effective in the slightest. As soon as the prospect realizes this voicemail is a sales pitch from a salesperson, it's getting deleted. And if you lead with your name and company, the prospect's finger hits the delete key almost immediately.
Sort of like putting the most important information above the fold in a news article, you have to front-load your voicemail with the most compelling and relevant information. Stating your name and company is not compelling, and it’s not as relevant as what you can do for the contact. What the person hears is, “I’m a salesperson and I want your money.” That’s the quickest way to get your voicemail deleted.