The simple truth is that you need to be more aware of what you’re leaving for other people to hear. Sure, this doesn’t always register as a priority for users, but it’s never too late to reassess your greeting. a. Reading/Speaking in the Imperfect Tone: Tone is absolutely everything. Users don’t want to come off as being too nice, as it sounds insincere, or being too terse, as it can be interpreted as being rude. That being said, striking the right balance is absolutely essential. Your greeting exists as its own entity, and therefore, it should NOT rely on callers’ familiarity with you. Instead, it needs to appeal to the masses. As such, your inflection, i.e. the way you state your name and directions, needs to be both welcoming and firm. b. Injecting Humor & Insincerity: While humor/light heartedness can be welcoming, it can also convey a sense of informality, insincerity, and ultimately unprofessionalism. Why, because you’re not there to lend your humor or to contextualize. Instead, you’re assuming the caller has a working knowledge of your personality to ground the message. Though this might not sound like it’s all that terrible—it can be detrimental. As stated above, one should NEVER rely on a caller’s familiarity with you. Instead, aim to appeal to the masses. Humor is ultimately subjective, meaning not everyone has the same tastes; therefore, someone is bound to be turned off by a quirky or off-color remark. While implementing a light-hearted or even tongue and cheek tone can work, it’s just a really bad idea.
Hi, you have reached the voicemail box of X. I am currently busy with a client of mine and hence will not be able to take your call right now. Kindly accept my apologies for the same. Please leave your phone number, name and purpose of your call so that I can get in touch when I am free. Thanks for understanding.

A professional voicemail greeting should be no longer than 60 seconds. List the important information we've discussed above, provide alternative methods of communication and close with a thank you.
1.) Sehr geehrter Anrufer unsere Mitarbeiter befinden sich immer noch in Kundengesprächen, bitte versuchen sie es zu einem späteren Zeitpunkt noch einmal. Haben sie Fragen zu unseren Produkten oder zu ihrer Bestellung, können sie uns gerne eine E-Mail senden, unser Support wird ihre Anfrage schnellstmöglich bearbeiten. Vielen Dank.