The parameter ZONE is read out of the AMO VBZGR branch CHRGINC. The ITR group of the incoming circuit determines the zone, depending on the ITR group of the destination.

The ZONE parameter includes the distance zone for charges based on time.

For the purpose of calculating costs for incoming connections, the line circuits can be allocated cost parameters that are made up of CARRIER and ZONE. You must use AMO TTBL to parameterize CARRIER and ZONE, which always work in combination. The empty zone, for which no charges are incurred according to time, is assigned by default.