H ELECTRICITY
H04 ELECTRIC COMMUNICATION TECHNIQUE
H04L TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
12/00 Data switching networks
H04L12/14 Charging; , metering or billing; arrangements; for data wireline or wireless communications
H04L12/1453 Methods or systems for payment or settlement of the charges for data transmission involving significant interaction with the data transmission network