| 摘要 |
PROBLEM TO BE SOLVED: To provide a SIP proxy server itself capable of receiving data from a caller SIP communication apparatus on behalf of a called SIP communication apparatus when the called SIP communication apparatus cannot circumstantially receive the data in a LAN under the control of the SIP proxy server, eliminating the load of retransmission of the data imposed on the caller user and providing the received data on behalf of the called apparatus to the called SIP communication apparatus suitably for its convenience. SOLUTION: Upon the receipt of an "INVITE" message from an apparatus 30 at the outside of a LAN 2 to a SIP communication apparatus 4 in the LAN 2 under the control of the SIP proxy server 1, the SIP proxy server 1 establishes a session and receives data on behalf of the destination SIP communication apparatus 4, not immediately transmits the received data to the destination SIP communication apparatus 4 but stores the data, and thereafter transmits the stored data to the destination SIP communication apparatus 4 when a prescribed condition is satisfied. COPYRIGHT: (C)2007,JPO&INPIT
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