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Old July 23rd, 2017   #2
ericthegeek
Task Group Member
 
Join Date: Aug 2008
Posts: 359
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The controller found your responder via DUB. When it tried to mute the responder, it didn't get a valid response. There was activity on the line during the response period (either noise or data), but there wasn't a valid break beforehand, so the response is not valid.
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