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This is great. I dialed a fake number, recorded it telling the numbers are incorrect or not in service, and used that as my greeting. And with iBlacklist you can put unknown callers to the greeting without it ringing

You can also erase any of your existing recordings associated with your voicemail box. To delete your name recording, unavailable greeting, or temporary greeting: Dial *98 on your OnSIP-registered phone. Enter your voicemail box number. Enter the PIN/password for your voicemail box. Press 0 for voicemail box options. Press 1 for unavailable greeting, 2 for your name, or 3 for temporary greeting. Press 2 to delete the existing recording on file.
People may not want to give information about who lives in their home to unknown callers for a variety of reasons. This information may be used by telemarketers who could then ask for you by name when they call again, scammers who might do the same, or people who are not interested in your welfare. Women living alone for instance may use the “we” instead of “I” to suggest more people living in a house, and can even opt for using the machine generated message or computer generated “male voice” instead of their own voice to increase their security at home. For personal security reasons, you might want to avoid indication of children in the home, too, and you certainly shouldn’t mention that you’re on vacation.