When a traffic channel is under maintenance, it will be shown as "Temporarily Unavailable" and won't be available for volume. If a channel becomes permanently unavailable, it will be removed from the Channel Optimization tab.
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Channel statuses cannot be edited while a channel is unavailable, however, when the channel is back up and running, the settings you had applied previously will be restored.
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​Reporting will still include past performance data for unavailable channels.