Communication control apparatus

• US 20050111450A1
• Filed: 10/29/2004
• Published: 05/26/2005
• Est. Priority Date: 10/31/2003
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Hoshino, Kazuyoshi, Miyamoto, Takashi, Kiyoto, Satoshi, Yumoto, Kazuma
• Granted Patent: US 7,443,842 B2
• Time in Patent Office: Days
• US Class Current: 370/389
• CPC Class Codes: H04L 65/1069 Session establishment or de-establishment
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]

Abstract

The present invention provides a communication control apparatus for controlling incoming and outgoing telephone calls (communication) in a corporate private telephone network and among a plurality of corporate telephone networks by using the IP. The communication control apparatus includes a plurality of interfaces connected to the plurality of corporate networks and processor, wherein when the processor receives an IP packet from a terminal that belongs to a first corporate network through any of the plurality of interfaces, the processor determines which of the corporate networks an incoming terminal for the packet belongs to based on outgoing SIP-URI and incoming SIP-URI contained in the header of the IP packet and performs necessary control so as to connect the outgoing terminal and the incoming terminal depending on each of the network to which the outgoing terminal belongs and other networks.

Claims

1. A communication control apparatus for controlling communication among a plurality of networks with a plurality of terminals connected thereto, said communication control apparatus comprising:

a plurality of interfaces connected to said plurality of networks; and

a processor;

wherein, when said processor receives a packet from a terminal that belongs to a first network through any of said plurality of interfaces, said processor determines whether an incoming terminal for said packet belongs to said first network or a second network based on first information and second information in said packet and controls necessary communication so as to connect said outgoing terminal and said incoming terminal depending on each of said first network or said second network.

2. A communication control apparatus according to claim 1, wherein said packet is an SIP (Session Initiation Protocol) packet, and said first information and said second information are an outgoing SIP-URI (Uniform Resource Identifier) and an incoming SIP-URI assigned to an SIP header in said SIP packet, respectively.

3. A communication control apparatus according to claim 2, further comprising:

a first table for making incoming SIP-URI correspond to a plurality of pieces of first incoming-terminal information for properly identifying said plurality of terminals for storage; and

a second table for making said first incoming-terminal information correspond to a plurality of pieces of second incoming-terminal information given in advance to each of said plurality of terminals for storage;

wherein said processor, when determining that the incoming terminal for said packet from said first network belongs to the first network, comprises;

means for retrieving said first table based on the incoming SIP-URI in said packet and obtaining said first incoming-terminal information;

means for retrieving said second table based on said first incoming-terminal information obtained and obtaining second incoming-terminal information for said terminal; and

means for connecting said outgoing terminal and said incoming terminal by using said second incoming-terminal information.

4. A communication control apparatus according to claim 3, further comprising:

a third table for making said plurality of pieces of first incoming-terminal information correspond with an interface to which said packet will be outputted for storage;

wherein, when said processor determines that an incoming terminal for said packet from said first network belongs to a second network, said processor retrieves said third table based on said first incoming-terminal information in said packet and determines an interface to which said packet received will be outputted.

5. A communication control apparatus according to claim 4, further comprising:

a fourth table for making said second address information and a port number for an outgoing terminal assigned to said packet received correspond to third address information and an empty port number for an own unit given to said plurality of interfaces for storage;

wherein, when said processor determines that an incoming terminal for said packet from said first network belongs to a second network, said processor retrieves the third address information given to said plurality of interfaces and the empty port number in the own unit based on said second address information and port number for the packet received, assigns said third address information and said port number retrieved to said packet, and transmits said packet to the incoming communication terminal.