If you are ready to record your voicemail greeting, you should already have a solid script. Whether you include your mission statement, some fun personal details, or a favorite quote, making your voicemail greeting personal is a great way to set your business apart. Write down what you're going to say, but try to avoid reading it verbatim as you record, or it may start sounding robotic and rehearsed. When listening to your voicemail greetings your callers shouldn't feel like they're listening to an impersonal recording. Keep it conversational. If you need help achieving that conversational tone, check out these tips.
Using the services of a professional actor with experience in phone system recordings helps ensure truly professional-sounding voicemail greetings for a business. Professional actors backed by experienced audio directors and studio-grade recording equipment can produce high-quality recordings for phone system messages such as voicemail greetings.

Record your voicemail away from background noise. While recording your voicemail, background noise can make your message very difficult to understand. Make sure to record your voicemail in an environment with minimal background noise. If you want to optimize your voicemail, practice a lot. Also, do not forget to take notes about the content of your voicemail. Practicing and taking notes while leaving an electronic voicemail is essential. A lot of practice will be so helpful in recording your message. But in some cases, you may not have time to practice. It may help to write your voicemail text on a piece of paper and read it in such cases.
On Air Recordings recommends you order professional voicemail greetings through their site, then describe the tone, approach, or voice direction you’re going for.