Expanding on the simple approach above, let the caller know who they've reached. This will not only eliminate people leaving voicemails by mistake, but it will reassure the caller that they have called the number they intended.
This is the time to show your personality. People are more at ease with someone with a bit of excitement in their voice because it shows that they are capable of holding a conversation. Just because you want to come off as professional does not mean you need to come off as monotone or unapproachable. If you’re funny, you could even add a joke to your message. Just be sure that you sound approachable and warm.

Remember to include your natural inflections and intonation to sound warm, welcoming and interested.
Because telephone calls are far more likely to reach you than scheduled appointments, the organization must have a system in place to intercept incoming calls to ensure they are turned into actual leads. A customized voicemail transcription for business calls directly affects the way customers perceive your brand. It sets the tone for every conversation that follows and is often the first contact with your brand for a potential customer. All of this builds on the power of the voice to build on your customers' relationships. The immediate resolution for any issues with transcripts of voicemails in hand lets small business owners keep on top of any client experience, maintain a pleasant presence, and remain coordinated.