Patent ID: 8725802

Claim:
A method for transferring a file in a conference system, comprising: sending, by a file sending UE, a SIP re-INVITE message or update message to a conference server when the file sending UE determines to send a file to a file receiving UE in a conference that the file sending UE itself participates in, wherein the SIP re-INVITE message or update message carries a file sending indication information, a conference identification of the conference in which the file sending UE participates and a Call-ID, wherein the file sending UE represents a file sending user terminal, wherein the conference is represented by the conference identification, wherein the value of the Call-ID is the same as the value of the Call-ID of another existing session included in the conference; receiving, by a file receiving UE, a SIP re-INVITE or update message carrying the file sending indication information, the conference identification of the conference in which the file sending UE participates and the Call-ID, from the conference server, wherein the file receiving UE represents a file receiving user terminal; sending, by the file sending UE, a file to the conference server after the conference server returns a SIP 200 OK to the file sending UE; and receiving, by the file receiving UE, the file from the conference server after the conference server receives a SIP 200 OK message returned by the file receiving UE.