Instead of stating the obvious, enhance your message with information your callers can use, such as how to reach someone immediately, when you will be returning calls, or where they can obtain after-hours service. Services that offer multiple custom greetings like Tendant allow you to store multiple greetings so you can have a greeting just for a holiday that you can use every year. Specify the information you want callers to leave. Your voicemail greeting presents a great opportunity to gather important details that will help you better serve your customers. This may include account numbers best times to return the call, and of course, a brief summary of the issue or purpose of the call.
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 in nearly a decade. Since then, I've (hopefully) 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.
According to Gartner Research, more than two-thirds of companies compete for business today primarily based on customer experience – up from only one-third back in 2010. Knowing this, it should not surprise you that customer-centric companies are 60% more profitable than companies that are not.