821: Compose a greeting message for outside callers. If your external greeting is blank the system default is used. Use the "5" and "#" keys to start and stop recording your greeting.
822: Compose a greeting message for internal callers. If your internal greeting is blank then your external one will be used. Use the "5" and "#" keys to start and stop "recording your greeting.
Get online help for the message commands.
70: Select message options.
Terminator key, used to stop recording, to terminate a password, etc.