Your message should sound inviting and happy, so the person leaving the message doesn’t get scared off. Don’t be unnaturally over the top happy that they are leaving you a message, but definitely try and get a happy tone into your message, and show them that you value their time and the fact that they are leaving you a message.
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.

Interesting Read : Why Should You Say NO To Increasing Customer Service Calls In 2020? Best Business Voicemail Greetings examples that you can try today for your brand
"We designed the default voicemail greetings to all users to standardize the feature across all Microsoft services." through. First, having a standard voicemail greeting cannot possibly work for someone who uses Skype for business. Or whose computer is set up to work in one language but expects callers using a different language.