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Good question. You want to spoof the outgoing Caller ID. I don't believe you can. The Caller ID information is generated by the phone company. The spoofers can do it but I believe they are using some kind of unauthorized hardware. This is a good question for AT&T Tech Support at their website (https://telephones.att.com) or call 1 (800) 222-3111 (in Canada, dial 1 (866) 288-4268).
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