D.4 Subscriber Profile Modification or Spoofing

A subscriber's profile stores data about the billing platform and service subscriptions. To bypass a billing system in real time, it is necessary to delete the subscriber's O-CSI subscription, which is used to make originating calls or to substitute the billing system address.

In order to prevent non-fare calls, O-CSI parameters imply that the call must be terminated if the billing platform is unavailable. However, this parameter can be changed, so that the call continues without addressing the platform. As a result, the legitimate platform does not receive information about the calls, and they are not billed.