ETIQUETTE TIP: Leaving Messages on Answering Machines, Voice Mail and Other Recording Services
Don't ramble.
Be clear and precise in your speech.
Provide only the essential information.
Leave your name (first and last), company, position, the time and date, purpose for call and a return number (repeat).
Don't assume the recording services is in perfect working condition.
Don't leave mysterious, teasing or ambiguous messages.