Friends and colleagues speak to each using first names only. So do people of authority. They do not call each other and leave voicemail messages asking for Mister, Miss, or Mrs. Therefore, when you call a person you want to do business with and you leave a voicemail message, refer to them by their first name only. Don't say mister, miss, or misses. Don't say their last name. Begin your voicemail message by saying only "hi/hello" followed by the person's first name. Or, you can even forget the "hi/hello" and just say the person's first name. That is how you show confidence and authority and separate yourself from weak salespeople.
Now, as far as i can tell, my Dad has never sent a text msg in his life. He's been retired for 10+ years and he loves to talk on the phone to friends and loved ones for hours. He has no reason to text. I also wouldn't put him into a general category when it comes to dad jokes. Meaning he might not have enjoyed this as much as I. So, after much deliberation I decided to welcome my Dad to the world of SMS the only way I felt was appropriate to the relationship we share.

Jodi R.R. Smith from Mannersmith Etiquette Consulting and author of From Clueless to Class Act: Manners for the Modern Woman and From Clueless to Class Act: Manners for the Modern Man agrees that veterinary medicine is a profession where phone calls remain important and necessary. If you need to leave a voice mail message for a client, Smith offers these ideas on how to make the most of your message.
In sales, immediate communication with your prospects and current customers is important. Being available to answer questions or further negotiate a deal allows your clients to feel secure and more apt to purchase from you. But what if you can’t answer the phone when they call? Make sure you have a voicemail system set up so your clients have the opportunity to leave you a message.