Does not explain how to do so in owner's guide.
It's not in the manual for the good reason that the AT&T 992 isn't an answering machine. If you want to record an outgoing voicemail greeting, you'll have to do it on the voicemail system, not on the phone. If you need instructions on how to do that, you'll have to tell us the make and model of the voicemail system or answering machine.
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