Method and system for charging of push to talk over cellular service and communication system

摘要

A method for charging of the Push to Talk over Cellular, PoC, service includes: a charging system, initializing charging of a PoC session and sends a response message of PoC Box charging; monitoring a trigger condition of PoC charging according to the response message; and judge, when a PoC user joins the PoC session, whether the user participates in the session as a PoC Box, and if so, setting a PoC Box identification for the user and send charging information to the charging system so as to charge the PoC session of the user, wherein the information includes the identification. The present invention also discloses a communication system, a charging system and a PoC server. With the present invention, the accuracy of PoC charging can be significantly improved.