System and method for monitoring time-related connection data detected by a network node

A system for verifying the connection-related communications data registered by a network node, where the connection-related communications data are used for calculating charges, the system having at least one call simulator connectible to the network node, the system comprising:

• at least one system clock;
• a device for establishing and clearing at least one predetermined test communications connection;
• at least one device for producing predetermined events required for calculating charges;
• at least one device for registering the times of at least some of the events required for calculating charges,
• a device for generating a connection-related reference data record containing time-related data that describe the registered events;
• the network node including:
• a device for registering the times of at least some of the events required for calculating charges;
• a network node system clock;
• and
• a device for generating at least one connection-related communications data record containing time-related data that describe the events registered in the network node;
• a correction device assigned to the call simulator having a correction value stored therein, the correction value corresponding to a systematic temporal measuring error between the location of the occurrence of an actual event and the registering of the actual event at a registration device of the call simulator, the time-related data of the connection-related reference data record being corrected by the stored systematic temporal measuring error in the correction device;
• a device for comparing the connection-related reference data record to the at least one communications data record;
• and
• a device for determining whether a difference between the time-related data of the communications data record and the connection-related reference data record lies within a predetermined range.