Before we get into business voicemail greetings, here are some interesting facts about voicemail messages to think about. 75% of all business calls are not completed on the first attempt. 60% of all incoming calls are less important than the work they interrupt. 90% of all written messages contain incomplete information.
Use a script: Regardless of your brand, it’s best to use a script to ensure you sound professional and touch on everything you need to. Casual voicemail messages may leave a poor impression. Keep it short and sweet: Your caller wanted to talk to you. When they start to hear the voicemail greeting they may feel disappointed.

My consultants sometimes do. The information tends to be "please call us back", but on the other hand said callback request tends to include a direct line that's not trivially publicly findable, so.
Timing is everything. The moment you receive the lead alert is the best time to make the follow-up call. If you call them days later, your chances of getting them on the phone are greatly diminished. By calling them right away, you’ll talk to more leads which will inevitably boosts sales. Role-play your voicemail scripts so you sound like you’re making your 20th call, not your 1st. Ask your friends and colleagues for honest feedback on your voicemail scripts. Continually review what’s working and what isn’t -- there’s always room for improvement. If you have the lead’s email address, follow up with an email, and let them know in the voicemail you’re going to do so. If you don’t have an email, let them know you’ll follow up with a text.