METHOD FOR TRANSMITTING A FILE OR MORE FROM ONE DEVICE TO MANY UNDER THE CONVERGED IP MESSAGING SYSTEM

摘要

A point-to-multipoint file transmission method in a CPM(Converged IP Messaging) system is provided to improve the performance and reliability of file transmission in transmitting files in a CPM system by transmitting a list of file receivers to a server, entrusting the server with file transmission management, and transmitting a file under the management of the server. In order to transmit a file to a plurality of receiving terminals, a sending terminal transmits a receiver list to a server in charge of the sending terminal(S210). Receiving the receiver list, the serve rin charge of the sending terminal verifies whether the sending terminal is capable of file transmission(S220). If so, the server in charge of the sending terminal asks each server in charge of each of the receiving terminals whether to be willing to receive the file(S230). Each server in charge of each receiving terminal verifies whether each receiving terminal is capable of file reception(S240). In case a server in charge of a receiving terminal judges that the receiving terminal is capable of file reception, the server asks the receiving terminal whether to be willing to receive the file(S250). The servers in charge of the receiving terminals respectively receive reception consent or denial responses from the receiving terminals and transmit the received responses to the server in charge of the sending terminal(S260). Based on the reception consent/denial responses, the server in charge of the sending terminal creates a new receiver list(S270).