Can the Adtran 7100 support no caller id for a certain class of service or certain user?
There is not a way to block incoming caller id in this manner. Feel free to make a Feature Request in the area.
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Do you want to mask caller-id on an incoming call from the outside if it is presented, or do you want to place a phone call and have your outbound caller-id blocked from being displayed at the remote receiving end?