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All Trunks Busy

Also known as ATB. The situation that occurs when a call is received by a trunk group and, because of the level of telephone traffic, the trunk group cannot route the call. If a trunk busy condition exists beyond a single reporting period (for example, it begins during period 1 and is still busy during period 2), that condition may be pegged for both periods.


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This page was last edited on July 30, 2020, at 16:22.
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