People may not want to give information about who lives in their home to unknown callers for a variety of reasons. This information may be used by telemarketers who could then ask for you by name when they call again, scammers who might do the same, or people who are not interested in your welfare. Women living alone for instance may use the “we” instead of “I” to suggest more people living in a house, and can even opt for using the machine generated message or computer generated “male voice” instead of their own voice to increase their security at home. For personal security reasons, you might want to avoid indication of children in the home, too, and you certainly shouldn’t mention that you’re on vacation.
"You have reached the CPX-2000 Voice Blackmail System. Your voice patterns are now being digitally encoded and stored for later use. Once this is done, our computers will be able to use the sound of *your* voice for literally thousands of illegal and immoral purposes. There is no charge for this initial consultation. However our staff of professional extortionists will contact you in the near future to further explain the benefits of our service, and to arrange for your schedule of payment. Remember to speak clearly at the sound of the tone. Thank you."

That’s the simple structure of a voicemail greeting. Overall, your greeting should be professional, but the wording can vary depending on the situation. Check out a sample below.
7.) Benvenuti alla John Doe DE, il vostro specialista in prodotti campione. Se volete effettuare un ordine, si prega di seguire la procedura di ordinazione nel nostro negozio online www.johndoe.de – Rimaniamo in attesa del vostro ordine. Per ulteriori domande, si prega di contattare il nostro servizio di assistenza tramite e-mail a: [email protected] – vi contatteremo al più presto possibile. Grazie per la vostra chiamata.