36. Hello. You’ve reached the office of [your name] at [your company]. I will be out of the office from [date] to [date]. Please leave your contact information with a brief message, and I will call you back as soon as I have the chance. If you need to speak with someone urgently, please contact [name of colleague] at [email or phone number]. Thanks for calling.
Last, make sure you keep this voicemail account up to date, especially if you have some kind of "out of office" message, telling people where you are. Michael Hyatt updates his voicemail message every day-- it may seem excessive, but it lets his callers know that he regularly checks his voicemail, cares about messages he receives, and is likely to get back to them.

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.
A phone call to your business is often the first encounter your customers and prospects have with your company. If no one is available to take the call, having the best professional voicemail greetings possible is important to leave a great first impression and to ensure that business opportunities don’t slip by.