Expect to spend $100-$400 for a voiceover session. (For a lower price point, look at Fiverr, but if you have more room in your budget, check out a voice acting agency.) The average professional studio session from start to finish will take approximately two hours, depending on how many scripts you have to record and how prepared you are.
As the odds of receiving a call back from your voicemail message are already low, you need to be very specific about what you say in your voicemail to give you the greatest chance of getting a call back. What you absolutely do NOT want to do is make yourself sound like a salesperson making a cold call. Instead, you want to sound like a very confident business colleague who deserves the respect of getting a call back.

In today’s world of digital messaging, email, and text messaging, your business answering machine message might be an afterthought. However, you’d be surprised how many people still prefer to use phones and speak to a person directly or leave a voicemail message that can be returned at a later time.
Perhaps the biggest mistake in a sales voicemail is pitching too aggressively. If you sound like a smarmy used car salesperson, your prospects are going to delete your voicemails faster than you can say "lowest price guaranteed!"