4.) Benvenuti dal Signor John Doe. Il Signor Doe non è in ufficio. Si prega di lasciare un messaggio e il Signor Doe vi richiamerà al più presto possibile. Grazie per la vostra chiamata.
In my (US-based) experience, doctor offices & the like have a place where you can fill out if they can leave messages or not (and some even have asked detailed messages vs callback messages), so that's my perspective! And that I can set different things for different numbers. So my cell phone they can leave detailed messages on any matter, my mother's house phone is detailed from billing only and otherwise callback, her cell phone is callback only. (And they also aren't allowed to tell her anything other than billing, so even if she does call them back about anything else! That was just a measure set up when I lived with her one summer & had no cell reception at her house.)

You can reach me by calling (your number). That number again is (your number), and ask for _________. I look forward speaking with you and thanks in advance for returning my call.”
1. Access your digital voice mailbox through your smartphone's touch screen. On an iOS phone, tap on the Phone application and then look for a square in the bottom right hand corner of the screen that reads Voicemail. Tap this button and your voice messages will appear on the screen. Click on any of the messages and press Play to hear the message. On an Android phone, a voicemail icon will appear at the top left of your screen in the Status area if you have an unread voicemail. Swipe your finger down from the top of the screen to view your notifications and then press New Voicemail. Your phone will dial the voice mailbox.