Queries Using Balance Distribution Normalizers

You can use balance distribution normalizers in prerating generator decision tables.

A balance distribution normalizer allows you to interrogate a subscriber balance. When you include a balance distribution normalizer in a decision table for a prerating generator, you can use the information about the amount of available balance to determine what information must be queried for the subscriber.

Based on the subscriber's location (which is stored in the HLR), you might want to allow or disallow a subscriber who is low on credit from making a call. You can this by performing a MAP callout to query the location in the HLR for all calls. Then you can use rating logic to bar or allow the call as required. If you use a balance distribution normalizer in the prerating generator decision table instead, you can perform a MAP callout only when the subscriber's balance is low. This allows you to make efficiency savings by minimizing the number of MAP callouts and results in fewer network queries.