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.
Consider adding 'You can also email your query to us at [insert email address here]. These queries will be answered within [insert time frame].' Again, if you intend to make a promise to your customer in a voicemail, ensure you keep it.

Creating a voicemail greeting might not be fun, but with the scripts I’ve shared, you should have an easier time. No need to practice time and time again — simply plug in your name, company title, and other details, then read it out loud to your phone’s voicemail greeting recorder. With a professional greeting, you’ll continue nurturing prospects even if you don’t pick up the phone.
Hello! Thanks for calling [LinkedPhone’s Customer Success Team]. We are currently helping other customers achieve their goals and want to do the same for you! Please leave a message with your name, number, and a brief description of how we can serve you. We promise to return your call [before close of business today]. In the interim, you can also check out our website at [linkedphone.com] for helpful answers to our most common requests. Thank you.