I have a confession to make: I haven’t recorded a new voicemail greeting since 2014. In the past four years, I (hopefully) have become more articulate, poised, and self-assured. But hear my voicemail recording, and you’d think I was still new to the work world, a little unsure of myself — and probably not an authority. Obviously I need toupdate it. And if you haven’t changed your voicemail greeting in over a year, you’re likely in the same boat. After all, a professional voicemail recording boosts your credibility, makes you seem more competent, and encourages whoever’s listening to it to continue the relationship. A relatively unprofessional one — like mine, for instance — does the opposite: It encourages prospects, recruiters, and potential connections to run in the other direction. With that in mind, I’ve written 18 unique voicemail greetings for every situation. Pick your favorite, practice a few times, then record your new voicemail.
4.) Herzlich willkommen bei Mustermann Solutions . Wegen einer firmeninternen Veranstaltung ist heute unser Sekretariat nicht erreichbar.Sie können uns aber gerne eine Nachricht hinterlassen. Ab Montag stehen wir Ihnen wieder persönlich zur Verfügung. Vielen Dank für Ihr Verständnis.

Expand your message with 'We're sorry we couldn't take your call this time.' The inclusion of 'this time' or 'on this occasion' suggests that the voicemail is the exception rather than the rule.
Make it funny! Now not everyone is the funniest comedian, and this time to practice a stand-up routine. No one wants to reach your voicemail just to be greeted with 15 knock-knock jokes. But you can easily add some humor, lighten up the tone a bit and try to leave people with a smile. Of course, keep it light – no dark humor here.