Now, for today’s lesson, I want to answer three questions about voicemail in English. Here’s what you’re going to learn: Basic rules to follow for voicemail. What you should and shouldn’t say when you leave a voicemail with some examples. What you should include in your own voice message for those moments when you can’t get to your 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.

Generally, people that call and leave messages are more likely to be ideal customers of your business. Your voicemail message is often not much more than a formality to the person calling.
If your answering system lets you supply your own mp3 or wav audio files for the greetings, consider hiring a pro to record it for you.