@Fa5t3r - I would try a wide range of different tones when recording and play them back to see what goes over the best and what projects the image you want people to hear. Remember that some people may be going to hear this message over and over again depending on how often they have to call you so you want it to be very pleasant and not at all irritating.
Whether you’re out for the day or are off for the week, the first rule of an out of office voicemail greeting is: let callers know when you’ll be back! You’ll save them the frustration of continuing to call and yourself the hassle of listening to redundant voicemails. It’s also a good idea to set the expectation of whether you are answering messages while you’re away, and who they can reach for assistance in your absence.

3.) Questa è la mailbox del Signor John Doe. Si prega di lasciare un messaggio o di richiamare questo numero più tardi. Grazie per la vostra comprensione.
Tone - select the right tone for your business brand. If your target market are young millennials, then the script would most likely include some slang words, be quite laid back and the script would be recorded in an energetic tone. If you primarily service the business market, then the script would be more articulate and recorded with a more professional tone.