A METHOD FOR CONTROLLING A CREDIT CUSTOMER CALL

The invention relates to a method for controlling a credit customer call. Subscriber-specific accounts on which the subscribers can purchase connection time are kept at a centralized point of a telecommunications network. In order that tariff changes taking place on the connections may be observed in a simple way without causing a high instantaneous load on the network, a request (Initial_DP) requesting connection time for the use of the connection is sent to a centralized point (SCP) of the network. In response to the request, the balance of the account of said customer is checked at the centralized point of the network and the length of the connection time to be assigned to the connection per a request sent by the exchange is determined. When the balance of the account permits, a message (AC) including information (ST) on the length of the connection time assigned to the connection is sent in response to the request sent by the network exchange. During the connection, the network exchange monitors the elapsing of the connection time assigned per request, and when the assigned connection time is less than a specified threshold, an additional time request (ACR) requesting additional connection time is sent to the centralized point. Tariff changes are checked at least in connection with each discrete additional time request (ACR), and on the basis of the check, the length of the connection time to be assigned per a request sent by the exchange is redetermined, said message being retransmitted if the account balance permits. When the connection is terminated, the amount is adjusted in accordance with the actual moment of termination.