System and method of billing based on the reported traffic load in a packet-oriented telecommunications network

Of telecom web automatically according to load's service according to the call charging system and method for in network reporting the user equipments. The system comprises at least media gateway control function, the MGCF report service load sends out of the MGCF with the register messaging and instant message (PIM) server. A load-based and service user is PIM registration server. The MGCF updating service load, the PIM server report for service load transmit the user, and when the causing user calling in report for service load transmit the charging node. Call control state of the call duration to send to the charging node. The charging node according to report service load by a charging tariff and automatically according to the duration for determining charging tariff call and calculates the expense of the call.