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% Outgoing Blocking or % ATB
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Percent Outgoing Blocking or Percent All Trunks Busy. A graphical representation equivalent to the numerical value of calls offered but not carried. For two-way and outgoing trunk groups, peak hour blocking is the largest % Outgoing Blocking. For incoming trunks, peak hour is the largest % ATB. Since % Outgoing Blocking is meaningless for incoming trunks, it is displayed as asterisk (*) in that column. For trunk groups without a queue, calls not carried are those calls that arrive when all trunks are busy. For trunk groups with a queue, calls not carried are calls that arrive when all trunks are busy and the queue is full (Queue Overflow) and calls removed from queue before being carried (Queue Abandoned).
Suggested actions: If a trunk group has a higher percent of blocking than desired, determine the exact reason that the trunk group is blocking calls.
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The Total Calls field indicates the calling volume. If excessive blocking is because of calling volume alone, consider the possibility of adding more members to the trunk group.
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If excessive blocking is not because of calling volume, the reason might be because trunks are in the maintenance busy state. You can use the Trunk Outage Report (described next) to identify those trunks determined to be out of service. Furthermore, and as required, use the ACA feature to monitor any trunk group still experiencing unexplained excessive blockage.
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For identified problems, determine whether maintenance has been alerted or should be alerted.
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