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.
Typically, a good business voicemail greeting should comprise the following elements: A warm greeting. Your name, the name of your company and department name. Make an apology for being unable to take the call. Ask the caller to leave a message. Let the caller know when to expect a return call.

This is exactly why you need to create such a voicemail that lets your prospects analyze it and give their details for you to reach out to them.
Fig: Unified Messaging Call flow (Exchange 2016 & Skype For Business Integration) Though we can use unified messaging role for multiple features related to enterprise voice, most organizations make use of it for voice mail and call routing.