Hi Anne Marie, I will follow your advice, always be kind and polite, use kind and polite language, repeating phone number twice, end a voicemail with thank you or have a good day, cool!, thanks:)
By default beginning April 2017, voicemail transcription is available for all Phone System in Microsoft 365 users. When you receive a voicemail, the message will be transcribed in the body of the voicemail email you receive in your mailbox. If you do not want to have transcription for your messages, ask your admin to disable it for you.

If you're using an in-house system like AT&T, Mitel, Avaya, etc., I'll create the phone greetings to input into these type of systems. Also, "Dial-In" service can be provided for phone systems that are unable to accept recordings. • Sub-Directory Recordings (After Hours, Hours and Location, Call Center, Office Closure-Inclement Weather, Product Descriptions, Returns Information, Shipping Info, Tech-Support Help, etc.
Here’s a generic business voicemail greeting example: “Thank you for calling [company/person’s name]. We are currently unavailable, but if you leave your name, phone number, and message, we will get back to you as soon as possible.” The above greeting is a professional voicemail script used by many growing and established businesses.