Length – if your callers typically wait 2 minutes at a time, then at least 2 minutes of programming should be the goal. The idea is to ensure the callers don’t hear repeated messages every time they call. A typical on-hold message is 4-8 minutes in length.
Identify Yourself—I believe identifying yourself through your voicemail greeting shows respect to everyone who calls you. It allows your callers to confirm they have dialed the right number. When people don’t include their name in their greeting, it leaves me wondering if they have something to hide. I have seen this to be true far too often.

The bottom line is that a business’s situation is likely to change often and rapidly, each of which need a unique and applicable voicemail greeting to cover the circumstances and timeline. For example, callers shouldn’t reach a business-as-usual voicemail, and therefore expect a return call within the business day, if the subject they’re calling is out on vacation for two weeks. Such a lack of communication is a recipe to lose that caller’s trust and tarnish the brand’s reputation.
5. "Hello, [Person's name] is chasing new adventures and is no longer with [Company name]. Please forward all future requests to [New or interim person's name] at [phone number]. Thank you!"