Hello, you have reached Dr. X. Right now, I am with a patient, so I’m unable to respond to your call immediately. If you need help with a prescription, call number Y. If you need to book/modify an appointment, call number z. Please, leave your name, and phone number and reasons for calling.
The most engaging messages are slightly unique in nature. They combine a mix of clever scripting and music. Slight humour is often used to promote a product or service and is usually quite effective. It's also very important to choose both the written and spoken tone that appeals to the characteristics of your audience. If your target market is the younger generation, a script that includes slang words and is quite laid back would be an excellent choice. If your target market is primarily business professionals, then a more articulate choice of words would be more suitable.

4.) Tous nos employés sont occupés avec d’autres clients. Votre appel a été pris en compte et un représentant vous rappellera dès que possible. Nous vous remercions pour votre compréhension – Au revoir.
If you’re getting phone calls from people other than your grandmother, then they probably aren’t going to recognize that it is you by just hearing your voice. Letting people know your name and even the name of your business lets them know right away that they have reached the right number. And as an added bonus, it lets callers with the wrong number know that they’ve reached the wrong person and you won’t have to listen to messages for strangers.