WO2002045373A3 - Communications system - Google Patents

Communications system Download PDF

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Publication number
WO2002045373A3
WO2002045373A3 PCT/GB2001/005253 GB0105253W WO0245373A3 WO 2002045373 A3 WO2002045373 A3 WO 2002045373A3 GB 0105253 W GB0105253 W GB 0105253W WO 0245373 A3 WO0245373 A3 WO 0245373A3
Authority
WO
WIPO (PCT)
Prior art keywords
server
pia
terminal
communications
logical channel
Prior art date
Application number
PCT/GB2001/005253
Other languages
French (fr)
Other versions
WO2002045373A2 (en
Inventor
Stephen Michael Read
Original Assignee
Ridgeway Systems And Software
Stephen Michael Read
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to AT01999096T priority Critical patent/ATE301362T1/en
Priority to CA2422764A priority patent/CA2422764C/en
Priority to DE60112469T priority patent/DE60112469T2/en
Priority to JP2002546385A priority patent/JP3757399B2/en
Priority to EP01999096A priority patent/EP1338127B1/en
Priority to AU1840402A priority patent/AU1840402A/en
Application filed by Ridgeway Systems And Software, Stephen Michael Read filed Critical Ridgeway Systems And Software
Priority to US10/432,468 priority patent/US7512708B2/en
Priority to AU2002218404A priority patent/AU2002218404B2/en
Publication of WO2002045373A2 publication Critical patent/WO2002045373A2/en
Publication of WO2002045373A3 publication Critical patent/WO2002045373A3/en
Priority to HK03107052A priority patent/HK1055364A1/en
Priority to US12/348,648 priority patent/US8291116B2/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
    • H04L63/0281—Proxies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/09—Mapping addresses
    • H04L61/25—Mapping addresses of the same type
    • H04L61/2503—Translation of Internet protocol [IP] addresses
    • H04L61/2514—Translation of Internet protocol [IP] addresses between local and global IP addresses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/09—Mapping addresses
    • H04L61/25—Mapping addresses of the same type
    • H04L61/2503—Translation of Internet protocol [IP] addresses
    • H04L61/2517—Translation of Internet protocol [IP] addresses using port numbers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/09—Mapping addresses
    • H04L61/25—Mapping addresses of the same type
    • H04L61/2503—Translation of Internet protocol [IP] addresses
    • H04L61/2521—Translation architectures other than single NAT servers
    • H04L61/2535—Multiple local networks, e.g. resolving potential IP address conflicts
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/09—Mapping addresses
    • H04L61/25—Mapping addresses of the same type
    • H04L61/2503—Translation of Internet protocol [IP] addresses
    • H04L61/256—NAT traversal
    • H04L61/2564—NAT traversal for a higher-layer protocol, e.g. for session initiation protocol [SIP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
    • H04L63/029—Firewall traversal, e.g. tunnelling or, creating pinholes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/10—Network architectures or network communication protocols for network security for controlling access to devices or network resources
    • H04L63/108—Network architectures or network communication protocols for network security for controlling access to devices or network resources when the policy decisions are valid for a limited amount of time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/102—Gateways
    • H04L65/1043—Gateway controllers, e.g. media gateway control protocol [MGCP] controllers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H04L65/1104—Session initiation protocol [SIP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H04L65/1106—Call signalling protocols; H.323 and related
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/14—Session management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
    • H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
    • H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
    • H04L69/329—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the application layer [OSI layer 7]

Abstract

The present invention relates to a communications system (1) for handling communications sessions, for example multimedia calls or voice calls. The communications system (1) comprises a local terminal (10), an external server (40), a proxy interface agent (PIA) (11) between the terminal (10) and a shared network (20). The communication means includes a NAT function (32) though which the communications session must pass. The communications session is carried over the network (20) over one or more logical channels between the terminal (10) and the external server (40), during which the first NAT function (32) applies network address mappings on the terminal's transport addresses (14). The PIA (11) acts on behalf of the terminal (10) in communications with the external server (40), and establishes a logical channel on an outbound connection to the server that serves as a control channel between the PIA (11) and the server (40). The PIA (11) establishes dynamic outbound connections to the server (40), and in response to a request from the server or in response to a request from the PIA itself (11), makes one or more associations between the terminal's transport address(es) (14) and identifiable logical channel(s) between the PIA (11) and the server. These identifiable logical channel(s) are established on one or more of the dynamic outbound connections from the PIA (11) to the server (40).
PCT/GB2001/005253 2000-11-30 2001-11-29 Communications system WO2002045373A2 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
CA2422764A CA2422764C (en) 2000-11-30 2001-11-29 Communications system using a proxy interface agent
DE60112469T DE60112469T2 (en) 2000-11-30 2001-11-29 COMMUNICATION SYSTEM
JP2002546385A JP3757399B2 (en) 2000-11-30 2001-11-29 Communications system
EP01999096A EP1338127B1 (en) 2000-11-30 2001-11-29 Communications system
AU1840402A AU1840402A (en) 2000-11-30 2001-11-29 Communications system
AT01999096T ATE301362T1 (en) 2000-11-30 2001-11-29 COMMUNICATION SYSTEM
US10/432,468 US7512708B2 (en) 2000-11-30 2001-11-29 Communications system
AU2002218404A AU2002218404B2 (en) 2000-11-30 2001-11-29 Communications system
HK03107052A HK1055364A1 (en) 2000-11-30 2003-09-30 Communications system.
US12/348,648 US8291116B2 (en) 2000-11-30 2009-01-05 Communications system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0029179A GB2369746A (en) 2000-11-30 2000-11-30 Communications system with network address translation
GB0029179.9 2000-11-30

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US10432468 A-371-Of-International 2001-11-29
US12/348,648 Division US8291116B2 (en) 2000-11-30 2009-01-05 Communications system

Publications (2)

Publication Number Publication Date
WO2002045373A2 WO2002045373A2 (en) 2002-06-06
WO2002045373A3 true WO2002045373A3 (en) 2002-10-17

Family

ID=9904157

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2001/005253 WO2002045373A2 (en) 2000-11-30 2001-11-29 Communications system

Country Status (11)

Country Link
US (2) US7512708B2 (en)
EP (2) EP1338127B1 (en)
JP (1) JP3757399B2 (en)
CN (1) CN1262095C (en)
AT (1) ATE301362T1 (en)
AU (2) AU1840402A (en)
CA (1) CA2422764C (en)
DE (1) DE60112469T2 (en)
GB (1) GB2369746A (en)
HK (1) HK1055364A1 (en)
WO (1) WO2002045373A2 (en)

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