Patent ID: 8688840

Claim:
A media transmission method using a session-based messaging service in an Internet Protocol (IP) Multimedia Subsystem (IMS), the method comprising: setting, by a first server being an originating IP Multimedia (IM) server in a calling party home network, Media Relay Capacity (MRC) information of a first User Equipment (UE) prior to a data communication session with the first UE, the MRC information including a number of multiple packets and a chunk size of each packet; notifying, by the first server, the MRC information to a second server being a terminating IM server in a called party home network; receiving, by the first server, multiple packets carrying a transmission message for the session-based messaging service according to the number of multiple packets and the chunk size from the first UE, and sending, by the first server, the multiple packets to a second UE via the second server; and receiving, by the first server, one response indicative a receipt or a missing of the multiple packets from the second UE via the second server; wherein setting the MRC information comprises: receiving, by the first server, first MRC information from the first UE through an INVITE message for establishing a Message Session Relay Protocol (MSRP) session; sending a request for second MRC information of the second UE to the second server; receiving the second MRC information from the second server; comparing the second MRC information of the second UE with the first MRC information; and setting a lesser one of the first and second MRC information as the MRC information of the first UE.