Write down your message before you record it. When reading it back, ask yourself: Does it make sense? Does it contain the right information? Is it grammatically correct? Is it clear? Is it positive and polite?
Length – if your callers typically wait 2 minutes at a time, then at least 2 minutes of programming should be the goal. The idea is to ensure the callers don’t hear repeated messages every time they call. A typical on-hold message is 4-8 minutes in length.

Your voicemail greeting can make a positive or negative impression on people. By considering your target audience and tone, you should be able to keep it positive. Length: Don’t make people wait minutes to leave a message. Apologies: If people expect your to be available, apologize for missing their call. Set expectations: Let people know when they may receive a callback, but be realistic. Accuracy: If you change your voicemail for things like holidays, be sure to update it when needed. How do You Set Up a Business Voicemail?
Often times knowing the purpose of their calls allows me to respond to their messages by sending them emails. As an example, when people have a question, often times I can send them an email answering their question. Knowing the purpose of the call also allows me to continue the communication through their voicemail if we end up playing phone tag.