I often judge organizations based on the ease of getting through the layers of electronic screenings to get my questions answered or speak to a live person.
Keep it Brief. Time is money in business, so if your voicemail is long, chances are the caller will simply disengage before the cue to leave a message even sounds. Keep your voicemail short. The most should be around 30 seconds, and even that’s pressing it. We’ve grown into a country where our attention span can last only about 10 seconds in some cases, so keep it short, brief and to the point. Persuade and Engage the Caller. If someone calls your business, they already have an intention. It’s the quality of your voicemail that plays a factor if they consider you a company they’d like to deal with. This is your chance to motivate someone to engage in a meaningful conversation with you. If your voicemail is shoddy, chances are they’ll hang up, or lose motivation to continue the call. In other words, your voice mail must engage and entice someone to the point that they care enough to leave you a message.

According to the examples, this voicemail greeting is primarily used to interact with individuals who do not know who Mike Avery is or what he does. The second example displays a higher level of professionalism by clearly identifying who Mike Avery is, and what his relationship to the caller is.
10. "Hello, you've reached [X company]. We can't take your call right now, but please leave your name, contact information, and reason for reaching out, and one of our team members will be in touch within 24 hours.