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
H04L12/141 Indication of costs
H04L12/1417 Advice of charge with threshold, e.g. user indicating maximum cost