Quality voice mail messages should include a pleasant greeting, your name, an invitation to leave a message containing the caller's contact information and reason for calling, and a confirmation that the call will be returned.
Be sure to speak clearly. It is typically recommended that your message be under 25 seconds, which is long enough to relay all important information to the caller. If needed, additional contact information, such another phone number where you can be reached in an emergency, may also be added. When recording a voice mail greeting for a business, the company and department names should be included.