To clear any customers doubts or expectations, make sure to mention on your voicemail when you’ll be available. Don’t say that you will “try” to return their call. Instead, offer them a realistic timeframe in which they can expect their call to be returned, so they know what to expect - whether it will take you 24 hours or a week to get back to them. This will eliminate your customer’s worries about your timeliness and encourage them to wait for your reply instead of heading over to your competitors.
Hello, you have reached the law firm of X. At this moment, I’m busy attending the case of another client, but I will definitely get back to you the moment I am free. Please, leave your details, including your name, address, situation, and your contact number. For something absolutely urgent, call me on y number.

Once you have your message, you need to actually record it. The exact process varies depending on whether you’re using a cell phone or office phone, but here’s the basic process: Press the voicemail button, or press and hold 1 on most cell phones. Enter your password. Record your message. Listen to the message you just recorded. Follow the prompts to save your message. Following Up on Voicemail Messages
Solution: Voicemail should be a part of your company’s overall phone system, Baldwin says, so you can maximize functionality and integrate it with other tools and business applications. “If your voicemail is separate because it’s stored solely on your mobile phone, you need to get it off that and put it on the messaging app that comes with your business voice phone service,” he says.