Patent ID: 8402154

Claim:
A method for transferring at least one media stream of a multimedia session, comprising: instructing, by an Application Server (AS), a first User Equipment (UE) and a second UE to establish a multimedia session; receiving, by the AS, a request for transferring at least one media stream of the multimedia session, wherein the request carries at least one media type of the at least one media stream requested to be transferred; and instructing, by the AS, the second UE and a third UE to establish at least one media stream of the media type; wherein the request is sent by the third UE and is intended to transfer at least one media stream of the media type from the first UE to the third UE; wherein instructing, by the AS, the second UE and a third UE to establish at least one media stream of the media type comprises: instructing, by the AS, the second UE and the third UE to negotiate media information according to the media type and establish the at least one media stream of the media type after successful negotiation; and wherein before establishing at least one media stream of the media type between the third UE and the second UE, the method comprises: asking, by the AS, the first UE about whether to allow the third UE to transfer the at least one media stream of the media type; receiving, by the AS, confirmation of the first UE if the first UE allows the third UE to transfer the at least one media stream of the media type; and continuing, by the AS, to instruct the third UE and the second UE to establish the at least one media stream of the media type wherein, after establishing at least one media stream of the media type between the third UE and the second UE, the method further comprises: deleting a transferred media stream of the at least one media type from the multimedia session between the first UE and the second UE; wherein after deleting the transferred media stream of the media type from the multimedia session between the first UE and the second UE, the method further comprises: requesting, by the first UE, the AS to recover the transferred media stream of the media type; performing, by the first UE and the second UE, media renegotiation according to the at least one media type under the control of the AS; and transmitting, by the first UE and the second UE, the at least one media stream of the media type after successful renegotiation.