You can record Primary, Alternate or optional Personalized greetings. Your Primary Mailbox greeting is for everyday use. Your Alternate Mailbox greeting is for times when you are away from the office. If your company subscribes to Caller ID, you can record Personalized Mailbox greetings. For Personalized Mailbox greetings, you program Flash to recognize a specific incoming telephone number. Your Personalized Mailbox greeting plays to callers from that number.