Businesses should have two main types of greetings to create an excellent call experience. The first one is what we call a “welcome greeting” – this greeting welcomes callers to your business. Typically, a welcome greeting will present a menu of call options like hours, location, or customer service. For more details on how to create a welcome greeting for your general business number, read this article.
Open your Phone app. Tap Voicemail. Select Greeting. By default, your voicemail will be setup with your carrier's generic greeting. To record a custom greeting, select Custom. Tap Record to begin recording your voicemail greeting. When you finish recording, tap Stop. To make sure you're happy with your new greeting, tap Play.

The stock phone or voicemail apps from most major providers include an option to save copies of your messages. Open your phone’s voicemail …
Hello, you have reached the law offices of X. Unfortunately, I am attending to another client right now, but I will return your call as soon as I can. Please leave me your name, reason for calling, and your number so I can connect you with the right department. This is far more professional than the other examples given in this guide. Lawyers should always be formal, smooth, and confident. Nobody is calling to make friends. They’re calling to get the job done. That’s why your message should be all business.