Practice makes perfect, and the same applies to reading and making your business voicemail calls. Before making those calls, give the call agents or representatives of your company time to rehearse. Let them go through the script a lot, so they’re familiar with the words. With enough time to practice, your call representatives can also make their own notes on the scripts to be guided and to avoid any monotony.
To record a new voicemail greeting, click the gear icon in the upper-right corner of your screen and select "Voice Settings.". Go to the "Voicemail & Text" tab to view your voicemail settings. Click "Record New," which may also say "Record New Message Using Phone.".

Make sure you keep your promises too. If you want to specify a time (which you should) ensure you get back to the customer within the timeframe.
That’s why it’s important to clearly identify yourself and your company right out of the gate. And while it may be tempting to tack on your phone number, it’s best to leave it out. Restating your number takes up valuable time, and the idea here is to provide all the information your customers need—and nothing they don’t. Keep voicemail greeting up to date. Many voicemail greetings take the generic approach of stating the person reached, the company name, and a statement about being away from the desk or unable to answer. The problem here is the fact that your callers already know this.