To record a call using your voicemail follow these steps: Open your Phone app. Click "voicemail" in the lower right-hand corner. Click "call voicemail" (depending on your carrier, you may have a different but similar option). Enter your iPhone voicemail password. Press the number associated with sending yourself a message.
Android phones can access voicemail by holding down the 1 key on the dial pad until the phone dials your 10-digit phone number. You will automatically connect to your mailbox and be prompted to enter your temporary password; this password is the last 4 digits of your phone number followed by the # key. Start the Google Voice app. Tap the three horizontal lines at the top left of the screen (sometimes called a hamburger menu), and then tap “Settings.” In the Voicemail section, tap “Voicemail greeting.” Tap “Record a greeting.” How do I access my voicemail? To call your voicemail on an Android phone, simply open your phone’s dial pad and hold your finger down on the “1” key. You can also call your voicemail from a different phone by calling your own number and tapping the pound key. How do you check your voicemail?

Since you are recording audio, make sure you are in a silent place or a place with minimum background noise. This will help you create a perfect business voicemail greeting clear.
Voicemail greetings are simple things, and in a business, they can seem unimportant. However, a voice mail greeting gets a lot of play with customers and associates—think of how often you are unable to take a phone call because you're on another line, away from your desk or out of the office.