The CodeRED system will leave a message on your answering machine or voicemail if you miss a CodeRED phone call. If you do not have an answering machine, the system will consider the call as "incomplete" and will attempt to call again after several minutes have passed. If your phone line is busy, CodeRED will try two more times to connect. At any point, you may re-dial the 800 number on your caller ID to hear a replay of the message sent.
To review which numbers on your caller ID may be CodeRED, visit the frequently asked question titled "How will I know when CodeRED is calling?".