In an ideal world, voicemail would be unnecessary. There would always be someone available to take customer calls and no one would complain about their calls not being returned and/or rejected. But of course, this perfect world isn’t possible. That’s why it’s important to give your callers options when you are unavailable. For example, aside from leaving a message, callers can also choose to listen to some relevant information about your business (such as a list of your services, your address, directions, hours of operation, and more).
Displays the name and telephone number of the incoming caller, provided they are not blocking that information.

Your message should sound inviting and happy, so the person leaving the message doesn’t get scared off. Don’t be unnaturally over the top happy that they are leaving you a message, but definitely try and get a happy tone into your message, and show them that you value their time and the fact that they are leaving you a message.
Hi, you’ve reached the main voicemail for [business name]. We pride ourselves on exceptional customer service, so please either leave a message with your contact information, or if it’s urgent, you can also call our 24/7 service line at [phone number]. Have a great day! You have reached [business name].