| 摘要 |
<p>A METHOD OF HANDLING A DATA STREAM DURING A HANDOVER IN A COMMUNICATIONS NETWORK (100) COMPRISING A FIRST USER AGENT (102) HAVING A FIXED ADDRESS, A PROXY SERVER (104) AND A SECOND USER AGENT (106), SAID METHOD COMPRISING THE STEPS OF: MAPPING AT THE PROXY SERVER (104) THE FIXED ADDRESS WITH A DYNAMIC NETWORK ADDRESS ALLOCATED TO THE FIRST USER AGENT (102); SENDING A REQUEST BY THE FIRST USER AGENT (102) TO THE SECOND USER AGENT (104) FOR A DATA STREAM; GENERATING BY THE SECOND USER AGENT (106) IN RESPONSE TO THE REQUEST A PLURALITY OF MESSAGES EACH COMPRISING PART OF THE DATA STREAM REQUESTED AND THE FIXED ADDRESS OF THE FIRST USER AGENT(102), WHEREIN THE MESSAGE IS A SESSION INITIATION PROTOCOL MESSAGE, AND SENDING THE MESSAGES TO THE PROXY SERVER (104); RECEIVING THE MESSAGES AT THE PROXY SERVER (104) AND DETERMINING THE MAPPED DYNAMIC NETWORK ADDRESS CORRESPONDING TO THE FIXED ADDRESS IN THE MESSAGE, AND FORWARDING THE MESSAGES TO THE DETERMINED DYNAMIC NETWORK ADDRESS; AND WHEN THE FIRST USER AGENT (102) IS ALLOCATED A NEW DYNAMIC NETWORK ADDRESS, REPLACING BY THE PROXY SERVER (104) THE MAPPED DYNAMIC NETWORK ADDRESS WITH THE NEW DYNAMIC NETWORK ADDRESS AND FORWARDING THE RECEIVED MESSAGES TO THE NEW DYNAMIC NETWORK ADDRESS. (FIGURE 1)</p> |
