| abstract |
A method of creating service usage records summarising usage of mobile datancommunications services, comprises monitoring message packets traversing a signalling linknbetween a serving support node and a gateway support node, these message packets includingnpackets for tunnelling data being transported by a mobile data communications service. Firstninformation is extracted from the data tunnelling packets, relating to data being tunnelled bynsaid packets, and second information is extracted, relating to implementation of the datantunnelling. The correlating said first and second information are correlated to generate anservice usage record. A source of data packets can be characterised by examining a tunnelndestination address in each monitored message packet, and characterising the message packetnas mobile-originated if the tunnel destination address is a gateway support node and asnmobile-terminated if the tunnel destination address is a serving support node. |