COMMUNICATION SYSTEM AND COMMUNICATION DEVICE

• US 20110196976A1
• Filed: 10/07/2009
• Published: 08/11/2011
• Est. Priority Date: 10/21/2008
• Status: Abandoned Application

• Current Assignee: Mitsubishi Electric Corporation, NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: Mitsubishi Electric Corporation, NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Inoue, Masahiro, Shimizu, Keiichi
• Application Number:
  US13/122,737
• Publication Number:
  US 20110196976A1
• Time in Patent Office: Days
• US Class Current: 709/228
• CPC Class Codes: H04L 65/1036 at the edge
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]
• CPC Class Codes: H04L 67/2876 Pairs of inter-processing entities at each side of the network, e.g. split proxies
• CPC Class Codes: H04L 67/5651 Reducing the amount or size of exchanged application data
• CPC Class Codes: H04L 69/04 Protocols for data compression, e.g. ROHC

Abstract

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.

Claims

1. A communication system comprising:

a SIP client;

a proxy of the SIP client; and

a node that is placed between the SIP client and the proxy and relays a received SIP message, wherein

when relaying a SIP message sent for the SIP client, the node replaces management information set up in a particular parameter of the received SIP message with an ID that uniquely denotes a content of the management information, and stores the ID and the management information by associating them with each other, and

when relaying a SIP message that is sent from the SIP client and when a same ID as the stored ID is set up in the particular parameter of the SIP message, the node replaces the ID with management information associated with the ID, and

when the ID is set up in a particular parameter of the received SIP message, the SIP client stores the parameter and the ID by associating them with each other, and

when a SIP message that includes a same parameter as the stored parameter is sent, the SIP client sets up an ID associated with the parameter in the parameter.

2. The communication system according to claim 1, wherein

the management information is a list of a URL of each proxy on a path, through which a SIP message sent for the SIP client passes, and of a URL of a sender of the SIP message.

3. The communication system according to claim 1, wherein

the management information is a list of a URL of each proxy on a path, through which a SIP message sent for the SIP client passes.

4. The communication system according to claim 1, wherein

the management information is a list of a plurality of character strings containing URLs of respective proxies on a path, through which a SIP message sent for the SIP client passes, and of a character string containing a URL of a sender of the SIP message.

5. The communication system according to claim 1, wherein

the management information is a list of a plurality of character strings containing URLs of respective proxies on a path, through which a SIP message sent for the SIP client passes.

6. The communication system according to claim 2, wherein

when sending a SIP message that includes a parameter, to which a URL list that corresponds to a parameter stored by associated with the ID or a list obtained by reversing an order of respective information of character string lists is to be set up, the SIP client further sets up an ID associated with the stored parameter, and also sets up instruction information, which instructs to replace the ID with a corresponding list and then reverse an order of respective information on the list, for the parameter, and

when receiving from the SIP client a SIP message in which a same ID as the ID stored and the instruction information are set up in a particular parameter, the node replaces an ID set up in the received message with a list obtained by reversing an order of respective information on a list associated with the ID, and transfers a resultant message.

7. The communication system according to claim 2, wherein

when sending a SIP message that includes a same parameter as the stored parameter, the SIP client sets up an ID associated with the parameter and, if necessary, sets up character-string-addition instructing information that instructs to add a character string to a predetermined position of a list, which is stored by associated with the ID, in the parameter, and

when receiving from the SIP client a SIP message in which a same ID as the stored ID and the character-string-addition instructing information are set up in a particular parameter, the node replaces the ID with a list associated with the ID, adds a designated character string to a position instructed by the instruction information, and transfers a resultant SIP message.

8. The communication system according to claim 1, wherein

when storing the management information by associating it with an ID that uniquely denotes a content of the management information, the node stores the information by associating it with connection information of the SIP client.

9. A communication device that is operated as the node according to claim 1.

10. A communication device that is operated as the SIP client according to claim 1.