For those with voicemail greetings that get changed about as often as a new president is elected, know that this is doing a serious disservice to the caller-recipient relationship. It signals to callers that the business is anything but an authority, most likely not very detail oriented, and has questionable overall credibility and competency. Those aren’t traits that any business wants to associate itself.
On Air Recordings recommends you order professional voicemail greetings through their site, then describe the tone, approach, or voice direction you’re going for.

Your voicemail says it all when it comes to missed calls. Therefore, a professional greeting is key when people leave you a message. People will form an opinion about your style of work just by listening to the quality of your voicemail greeting. And remember, always listen to your voicemail greeting when you finish recording to make sure it's acceptable.
Users often don’t invest enough time into their messages, resulting in incomplete, unprofessional, or otherwise under-whelming greetings. Sure, crafting a greeting doesn’t sound all that complicated; however, there are a number of pitfalls users can fall into—i.e. informality, terseness, sincerity, lack of direction, and more. While none of these sound too catastrophic, they are often interrelated. As such, they tend to worsen any problem. For example, humor can cause informality, worsen ambiguity, and weaken sincerity. That being said, users should strive to avoid ALL these pitfalls.