Users often don’t invest enough time into their messages, resulting in incomplete, unprofessional, or otherwise under-whelming greetings. Sure, crafting a greeting doesn’t sound all that complicated; however, there are a number of pitfalls users can fall into—i.e. informality, terseness, sincerity, lack of direction, and more. While none of these sound too catastrophic, they are often interrelated. As such, they tend to worsen any problem. For example, humor can cause informality, worsen ambiguity, and weaken sincerity. That being said, users should strive to avoid ALL these pitfalls.
Identify Yourself—I believe identifying yourself through your voicemail greeting shows respect to everyone who calls you. It allows your callers to confirm they have dialed the right number. When people don’t include their name in their greeting, it leaves me wondering if they have something to hide. I have seen this to be true far too often.

Please leave your contact info, full name, and other details and I’ll call you back once I’m back in the [city/country/area]. Ciao for now!”
10.) Bonjour, et bienvenue chez John Doe. Pour des raisons techniques, nous ne pouvons pas prendre votre appel personnellement. Merci de votre compréhension. Nous essayons de trouver une solution. Si vous le souhaitez, vous pouvez laisser un message sur notre page d'accueil www.johndoe.de - Merci et au revoir.