“Ummm… uh, listen carefully. I, I have only 10 seconds to explain to you how to leave a message on one of these machines. Now… now, the first step is, is the most important step there is. What, what you’ve gotta do is ummm… and, and, and, and, uh… well.”
Hello, it’s obvious you have bad timing, because nobody is home. Please leave your name, telephone number, and a brief message in a voice similar to mine, and your call will be returned as soon as humanly possible.

Here is a great short example: Hello this is [first name] with {business name} in {city name} . I apologize I cannot answer the call at the moment, please leave me your name, number, and I will return the call as soon as get back to the phone. Here you have let the caller know that they have reached your business, and that you are sorry you can’t answer right away. It assures them that you are interested in their call, and that you will get back with them as soon as you can.
It’s a good practice for each of your team members to have their own personal business phone numbers. There are many reasons why they shouldn’t use their personal cell phone number for business, so you’ll want to give them their own phone number through your VoIP provider or phone system.