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Hi I have a system with one asterisk box in front and a few PSTN gateways in the back. When a call comes from PSTN, it's directly forwarded to the edge/user asterisk box. Now if a number is dialled, and that number is not in use, blocked due to lack of paying etc, I want to signal that back to the PSTN gateway, making this playback or playtones to avoid picking up the phone. Can someone