Session mobility based on compensation mechanism

In recent years, as Session Initiation Protocol has great function and good scalability, voice and video communication based on SIP has been adopted by operators. Session mobility is a mechanism which provides advanced function to the transfer of terminal equipment in process of session. Session mobility can provide more options to user and larger benefit space to operator than. In this paper, we proposed a mechanism to solve the data loss and data mistaken sending by transfer of terminal in process of session mobility which uses Serial Number of Prediction algorithm to retransmit the lost data appropriately. Finally, the proposed mechanism is implemented using an open source of SIP.