Telephone communication system

• US 20030202503A1
• Filed: 04/29/2002
• Published: 10/30/2003
• Est. Priority Date: 04/29/2002
• Status: Active Grant

• Current Assignee: Iwatsu Electric Company Limited
• Original Assignee: Iwatsu Electric Company Limited
• Inventors: Inui, Masanori
• Granted Patent: US 7,280,531 B2
• Time in Patent Office: Days
• US Class Current: 370/352
• 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]
• CPC Class Codes: H04M 3/42314 in private branch exchanges
• CPC Class Codes: H04M 7/006 Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP) , including next generation networks with a packet-switched transport layer H04L65/00 takes precedence; aspects not specific to the type of network H04M3/00; special services in those networks H04M3/42

Abstract

A telephone communication system is disclosed, in which a plurality of telephone stations based on an Internet protocol are connected to a LAN network to form an IP network including at least one constituent unit. Each constituent unit of said IP network, comprising: SIP server means based on a protocol defined for controlling the start, end and change of a session of an interactive communication; resource management server means for the control storage and delivery of station state databases of said plurality of telephone stations, and application server means. The SIP server means, the resource management server means and the application server means are connected to said LAN internet for offering required services to said plurality of telephone stations, so that information transmission among said plurality of telephone stations and each of said server means are performed on a packet-wise basis.

Claims

1. A telephone communication system, comprising:

a plurality of telephone stations based on an Internet protocol connected to a LAN network to form an IP network including at least one constituent unit;

for each constituent unit of said IP network, comprising;

SIP server means based on a protocol defied for controlling the start, end and change of a session of an interactive communication;

resource management server means for the control storage and delivery of station state databases of said plurality of telephone stations, and

application server means;

said SIP server means, said resource management server means and said application server means being connected to said LAN internet for offering required services to said plurality of telephone stations,

information transmission among said plurality of telephone stations and each of said server means being performed on a packet-wise basis.

2. A telephone communication system according to claim 1, in which said application server function is an incoming call management server for controlling incoming call information.

3. A telephone communication system according to claim 1 or 2, in which said LAN network is connected to the Internet;

and an edge part connected to said LAN network has placed therein a firewall for protecting against an unauthorized access to said LAN network.

4. A telephone communication system according to clam 1 or 2, in which at least one of said plurality of telephone stations is connected via a gateway to a public telecommunication network.