I have a confession to make: I haven’t recorded a new voicemail greeting since 2014. In the past four years, I (hopefully) have become more articulate, poised, and self-assured. But hear my voicemail recording, and you’d think I was still new to the work world, a little unsure of myself — and probably not an authority. Obviously I need toupdate it. And if you haven’t changed your voicemail greeting in over a year, you’re likely in the same boat. After all, a professional voicemail recording boosts your credibility, makes you seem more competent, and encourages whoever’s listening to it to continue the relationship. A relatively unprofessional one — like mine, for instance — does the opposite: It encourages prospects, recruiters, and potential connections to run in the other direction. With that in mind, I’ve written 18 unique voicemail greetings for every situation. Pick your favorite, practice a few times, then record your new voicemail.
2. Hi, you’ve reached [your name]’s voicemail box. I can’t come to the phone right now, but if you leave your contact information I’ll get back to you within 24 hours.

Your call is important to us and we will get back to you as soon as possible. Please leave your full name, contact details, phone number, and availability after the beep and we will call you back straight away. Thank you!”
Speak clearly. Don't mumble; speak too fast or too slow. You want people to understand your greeting. The way you communicate with people through your greeting is an example of how you communicate with people in the real world.