METHOD FOR OBTAINING PACKET BILLING INFORMATION BASED ON SESSION INITIATION PROTOCOL

摘要

Disclosed is a method for controlling billing in a Session Initiation Protocol (SIP) call server. The method includes the steps of: receiving an invite message from a calling SIP terminal; transmitting a (100) trying message to the calling SIP terminal, the (100) trying message including transmission period information of a keep-alive message; establishing an SIP call between the calling SIP terminal and a called SIP terminal, and receiving the keep-alive message from the calling SIP terminal in the transmission period, the keep-alive message including billing information; and when the SIP call is terminated, transmitting final billing information received from the calling SIP terminal to a billing server.