| 摘要 |
A communication system including a SIP client, a proxy, and a node. When the node relays a SIP message sent for the SIP client, the node replaces management information set up in a parameter with an ID, and stores the ID and the management information by associating them with each other. When the node relays a SIP message in which the stored ID is set up, the node replaces the ID with the management information associated with the ID. When an ID is set up in a parameter of a received SIP message, the SIP client stores the parameter and the ID by associating them with each other. When the client sends a SIP message that includes the stored parameter, an ID associated with the parameter is set up in the parameter.
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