WO2006015525A1 - Procede d'appel point a point entre deux terminaux multimedia dans le reseau prive - Google Patents

Procede d'appel point a point entre deux terminaux multimedia dans le reseau prive Download PDF

Info

Publication number
WO2006015525A1
WO2006015525A1 PCT/CN2005/000205 CN2005000205W WO2006015525A1 WO 2006015525 A1 WO2006015525 A1 WO 2006015525A1 CN 2005000205 W CN2005000205 W CN 2005000205W WO 2006015525 A1 WO2006015525 A1 WO 2006015525A1
Authority
WO
WIPO (PCT)
Prior art keywords
private network
terminal
multimedia gateway
call
multimedia
Prior art date
Application number
PCT/CN2005/000205
Other languages
English (en)
Chinese (zh)
Inventor
Jiazhou Li
Jia Cao
Yawei Chai
Ziming Jin
Chenggang Liu
Original Assignee
Zte Corporation
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
Application filed by Zte Corporation filed Critical Zte Corporation
Publication of WO2006015525A1 publication Critical patent/WO2006015525A1/fr
Priority to GB0702877A priority Critical patent/GB2432078B/en

Links

Classifications

    • 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
    • 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
    • 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
    • H04L61/256—NAT traversal
    • H04L61/2578—NAT traversal without involvement of the NAT server
    • 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
    • H04L65/1069—Session establishment or de-establishment
    • 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
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • 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

Definitions

  • the present invention relates to multimedia communication, and more particularly to a point-to-point calling method for a multimedia terminal in two private networks based on the H.323 protocol. Background technique
  • H.323 which is a packet network multimedia communication standard developed by the International Telecommunication Union
  • NAT Network Address Translation
  • the H.323 protocol itself does not consider the application of NAT. Its address embedding feature conflicts with the NAT device, which creates the problem of interworking between the internal and external networks. How to realize the interworking of multimedia terminals (hereinafter referred to as H.323 terminals) in two private networks is an urgent problem that the industry needs to solve. There are two main solutions to this problem:
  • the MCU uses the MCU on the public network to hold a conference to realize communication between the two terminals.
  • the MCU holds a conference in which two terminals need to communicate to realize communication between the two terminals.
  • the following Defects (1) Requires the user to reserve a meeting, and the operation is complicated.
  • the user can implement the call port H by directly calling the name of the other terminal. Only when the calling and called users are in the private network, the conference needs to be initiated to realize the communication between the two parties. You need to be familiar with the network environment to operate correctly, and the operability is poor. (3), point-to-point calls cannot be made directly between the two terminals.
  • the NAT method has the following drawbacks: (1) The protocol only supports NAT traversal in UDP mode, and does not provide TCP traversal mode. (2) At the same time, the UDP traversal method does not support symmetric type NAT.
  • the technical problem to be solved by the present invention is to propose a method for point-to-point calling of multimedia terminals in two private networks, and to solve the problem that when the H.323 terminals in two private networks communicate, the calling process cannot traverse the NAT devices of the two private networks. And the problem of interoperability.
  • the present invention provides a method for point-to-point calling of a multimedia terminal in two private networks, which is characterized in that it comprises the following steps:
  • Step 1 Add a multimedia gateway on the public network to implement signaling and media switching between the private network terminals;
  • Step 2 For the call between the two private network terminals, the H.245 channel of the H.323 protocol is established with the two private network terminals through the multimedia gateway, and the capability interaction, the master-slave decision, and the establishment of the logical channel are performed.
  • the point-to-point call between the two private network terminals is transferred to the pair of multimedia gateways, and the two private network terminals are matched by the multimedia gateway into a pair of calls;
  • Step 3 The multimedia gateway forwards information between the two private network terminals, thereby implementing point-to-point calls of the multimedia terminals in the two private networks.
  • the method for point-to-point calling of the multimedia terminal in the two private networks is characterized in that, before the second step, the method further includes: recording the multimedia terminal and the multimedia gateway in the two private networks on the gatekeeper of the public network, The gatekeeper implements management of the terminal and performs terminal type judgment.
  • Step 201 The private network terminals A and B respectively send a registration request to the gatekeeper, and the gatekeeper responds to the registration message confirmation, and determines that the terminal type is a private network terminal according to the IP address in the registration message and the routing address of the message header;
  • Step 202 The multimedia gateway sends a registration request to the gatekeeper, and the gatekeeper responds to the registration message to confirm that the registered endpoint type is a multimedia gateway.
  • the gatekeeper receives the call request message in an idle state
  • the call request is sent by the multimedia gateway, further determine whether the called party is a private network terminal; if the called party is a private network terminal, hang up the calling party, notify the called terminal to call the multimedia gateway + the calling terminal; and then return to Idle state; if the called party is not a private network terminal, it responds to the called terminal's call Return to the idle state after the address;
  • the call request is not sent by the multimedia gateway, it is determined whether the called party or the calling endpoint has a private network terminal; if not, the called terminal's call address is returned to the idle state; if the called party or the calling endpoint is private
  • the network terminal determines whether there is a registered multimedia gateway; if yes, it responds to the multimedia gateway's call address and then returns to the idle state; if there is no registered multimedia gateway, the call is rejected and returned to the idle state.
  • step 2 includes the following steps:
  • Step 301 The private network terminal A initiates a call request to the private network terminal B to the gatekeeper.
  • Step 302 After the gatekeeper determines that the called terminal is a private network terminal, returns the call address of the multimedia gateway to the private network terminal A;
  • Step 303 The private network terminal A initiates a call connection to the multimedia gateway, and the called name is still the private network terminal B;
  • Step 304 After receiving the call connection of the private network terminal A, the multimedia gateway initiates a call request to the terminal B to the gatekeeper.
  • the calling name includes the multimedia gateway name information and the private network terminal A information.
  • Step 305 the gatekeeper determines the calling party. After the multimedia gateway is called a private network terminal, the multimedia gateway hangs up the call to the terminal B;
  • Step 306 the gatekeeper uses the private network terminal B to notify the gatekeeper to register the channel to initiate the call to the multimedia gateway, and the call name is the multimedia gateway + the private network terminal A;
  • Step 307 The private network terminal B confirms to the gatekeeper response message, and initiates a call request to the multimedia gateway + private network terminal A to the gatekeeper;
  • Step 308 the gatekeeper returns the call address of the multimedia gateway to the private network terminal B.
  • Step 309 the private network terminal B initiates a call connection to the multimedia gateway, and the called name is a multimedia gateway + a private network terminal A;
  • Step 310 The multimedia gateway matches the call connection between the private network terminal A and the private network terminal B as a pair of calls;
  • Step 311 The private network terminal A and the private network terminal B respectively establish an H.245 channel of the H.323 protocol with the multimedia gateway, and perform capability interaction, master-slave determination, and establishment of a logical channel.
  • BRIEF DESCRIPTION OF THE DRAWINGS 1 is a schematic diagram of an application network topology structure of a method proposed by the present invention.
  • FIG. 2 is a signaling flow chart of a point-to-point call of a multimedia terminal in two private networks proposed by the present invention
  • FIG. 3 is a state diagram of a judgment policy when a gatekeeper receives a call request. The best way to implement the invention
  • FIG. 1 is a schematic diagram of an application network topology structure of the method proposed by the present invention.
  • the implementation of the present invention mainly relates to the following devices: H.323 terminal, NAT device, multimedia gateway, gatekeeper.
  • terminal A and terminal B are on different private networks.
  • Terminal A and terminal B and public network communication need to pass through the NAT device to translate the private network address of the terminal information into a public network address.
  • the gatekeeper of the public network implements the management of the terminal, and the multimedia gateway implements signaling and media switching between the private network terminals.
  • FIG. 2 is a signaling flow chart of a point-to-point call of a multimedia terminal in two private networks proposed by the present invention. As shown in FIG. 2, the signaling process of the method proposed by the present invention is as follows:
  • Private network terminal A sends a registration request to the gatekeeper.
  • the gatekeeper responds to the registration message with the private network terminal A.
  • the gatekeeper knows that the terminal A is a NAT terminal according to the IP address in the registration message of the terminal A and the routing address of the message header.
  • the private network terminal B sends a registration request to the gatekeeper.
  • the gatekeeper responds to the registration message with the private network terminal B.
  • the gatekeeper knows that the terminal B is the terminal after the NAT according to the IP address in the registration message of the private network terminal B and the routing address of the message header.
  • the multimedia gateway sends a registration request to the gatekeeper.
  • the gatekeeper After receiving the registration message of the multimedia gateway, the gatekeeper responds to the multimedia gateway to confirm the registration message.
  • the registered endpoint type is a multimedia gateway.
  • the private network terminal A initiates a call request to the private network terminal B to the gatekeeper.
  • the gatekeeper finds that the called terminal B is a terminal after the NAT, and uses the multimedia gateway to transfer the intercommunication between the calling and called terminals, and the address sent back to the private network terminal A is the address of the multimedia gateway.
  • the private network terminal A initiates a call connection to the multimedia gateway, and the called name is still terminal B.
  • the multimedia gateway After receiving the call connection of the private network terminal A, the multimedia gateway knows that the called multimedia gateway sends a call request to the terminal B to the gatekeeper according to the call information of the terminal A, and the calling name includes the multimedia gateway name information and Terminal A information, for example, using the multimedia gateway + terminal A name. 11.
  • the gatekeeper finds that the called terminal B is a private network terminal, and the calling party is a multimedia gateway. Therefore, the multimedia gateway hangs up the call to the terminal B. If the called party is a public network terminal, the gatekeeper directly responds to the address of the terminal, and the multimedia gateway directly calls the terminal.
  • the gatekeeper uses the private network terminal B to notify the private network terminal B of the channel registered by the gatekeeper to initiate a call to the multimedia gateway, and the call name is multimedia gateway + terminal A. See the non-standard message extension for message definitions.
  • the private network terminal B confirms the response message to the gatekeeper. See the non-standard message extension for message definitions.
  • the private network terminal B initiates a call request to the multimedia gateway + terminal A to the gatekeeper.
  • the gatekeeper responds to the address of the multimedia gateway.
  • the private network terminal B initiates a call connection to the multimedia gateway.
  • the multimedia gateway is called the multimedia gateway + terminal A according to the call of the private network terminal B, so the private network terminal B and the private network terminal A are matched into a pair of calls.
  • the H.245 channel of the H.323 protocol is established between the private network terminal A and the multimedia gateway, and capability interaction, master-slave decision, and logical channel establishment are performed.
  • the H.245 channel of the H.323 protocol is established between the multimedia gateway and the private network terminal B, and the capability interaction, the master-slave decision, and the establishment of the logical channel are performed. 19.
  • the multimedia gateway forwards information between the private network terminal A and the private network terminal B.
  • commandType NatNSMCommand the way the command is
  • FIG. 3 is a state diagram of a judgment policy when the gatekeeper receives a call request.
  • the received call request of the gatekeeper includes:
  • the multimedia gateway sends a call request: (1) calling the private network terminal; (2) calling the public network terminal.
  • the terminal issues a call request: (1) The calling party and the called terminal have one in the private network; (2) The calling party The called terminal is on the public network.
  • the gatekeeper receives the call request message in the idle state, first determines whether the call request is sent by the multimedia gateway; if yes, further determines whether the called party is a private network terminal; if the called party is a private network terminal, hangs up The calling party notifies the called terminal to call the multimedia gateway + the calling terminal; then returns to the idle state; if the called party is not the private network terminal, it responds to the called terminal's calling address and then returns to the idle state.
  • the call request is not sent by the multimedia gateway, it is determined whether the called party or the calling endpoint has a private network terminal; if not, the called terminal's call address is returned to the idle state; if the called party or the calling endpoint is private
  • the network terminal determines whether there is a registered multimedia gateway; if yes, it responds to the multimedia gateway's call address and then returns to the idle state; if there is no registered multimedia gateway, the call is rejected and returned to the idle state.
  • the technical solution proposed by the present invention realizes the interworking of two terminals by adding a multimedia gateway device in the public network and transferring the calls of the terminals in the two private networks.
  • the entire transfer process is transparent, and the user is transparent. It is not necessary to know the information of any network structure, and it is convenient and simple to use; the method proposed by the present invention can support any NAT type.
  • the method proposed by the invention adopts: 1. Solving the point-to-point call problem of the private network H.323 terminal, and the user can no longer care about the network environment in which the user is located, and can perform a point-to-point call between two points. 2, easy to maintain.
  • the multimedia gateway device Through the multimedia gateway device, the network environment problem on the user side is centralized to the central office device for solution, which is convenient for deployment, management, maintenance, and upgrade. 3. The interoperability of the system is improved.
  • the call problem of the post-NAT user terminal of different systems can be converted into the interworking of the central office gateway, and the multimedia gateway is generally deployed on the public network, thereby eliminating the H.323 traversing NAT problem.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Business, Economics & Management (AREA)
  • General Business, Economics & Management (AREA)
  • Multimedia (AREA)
  • Computer Security & Cryptography (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

L'invention concerne un procédé d'appel point à point entre deux terminaux multimédia dans le réseau privé par ajout d'un dispositif passerelle multimédia sur le réseau public; l'appel point à point entre les terminaux privés est remplacé par l'appel sur la passerelle multimédia. La passerelle établit ensuite la voie H.245 du protocole H.323 respectivement sur les terminaux privés par le biais du dispositif passerelle multimédia, le procédé consiste ensuite à alterner les capacités, à réaliser la détermination principale et subordonnée, et à établir une voie logique pour transmettre finalement les informations des deux terminaux privés via le dispositif passerelle multimédia dans le réseau privé. L'ensemble du procédé de transfert décrit dans l'invention est facile à mettre en oeuvre pour les utilisateurs. Il ne leur est pas nécessaire de connaître les informations de la structure en réseau, ce qui rend le procédé pratique et simple à mettre en oeuvre. Le procédé décrit dans l'invention admet n'importe quel type de NAT.
PCT/CN2005/000205 2004-08-13 2005-02-22 Procede d'appel point a point entre deux terminaux multimedia dans le reseau prive WO2006015525A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0702877A GB2432078B (en) 2004-08-13 2007-02-14 A method for point-to-point calling between two multimedia terminals in the private network

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200410058372.6 2004-08-13
CNB2004100583726A CN100401700C (zh) 2004-08-13 2004-08-13 一种两个私网内的多媒体终端点对点呼叫的方法

Publications (1)

Publication Number Publication Date
WO2006015525A1 true WO2006015525A1 (fr) 2006-02-16

Family

ID=35839127

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2005/000205 WO2006015525A1 (fr) 2004-08-13 2005-02-22 Procede d'appel point a point entre deux terminaux multimedia dans le reseau prive

Country Status (3)

Country Link
CN (1) CN100401700C (fr)
GB (1) GB2432078B (fr)
WO (1) WO2006015525A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11290685B2 (en) * 2013-07-03 2022-03-29 Huawei Technolgoies Co., Ltd. Call processing method and gateway

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100384168C (zh) * 2005-12-30 2008-04-23 四川长虹电器股份有限公司 H.323系统的多媒体会话穿越nat设备的方法
CN101179534B (zh) * 2006-11-08 2010-05-12 华为技术有限公司 一种消息处理方法、系统及媒体网关控制器
CN101478505B (zh) * 2009-01-23 2011-09-07 建汉科技股份有限公司 不同私有网络的网络装置间建立网络系统及网络联机方法
CN102571853A (zh) * 2010-12-16 2012-07-11 中国移动通信集团四川有限公司 移动终端的远程点对点通信方法、系统和装置
CN103391335A (zh) * 2013-08-01 2013-11-13 北京市翌晨通信技术研究所 一种直接访问ip私网的网络通信方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010092015A (ko) * 2001-09-07 2001-10-24 변진우 고속 무선 인터넷망에서 멀티미디어 통신용 인터넷폰서비스 제공 방법 및 시스템
US20020042832A1 (en) * 2000-08-14 2002-04-11 Fallentine Mark D. System and method for interoperability of H.323 video conferences with network address translation
US20030093563A1 (en) * 2001-10-10 2003-05-15 Young Bruce Fitzgerald Method and system for implementing and managing a multimedia access network device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6496867B1 (en) * 1999-08-27 2002-12-17 3Com Corporation System and method to negotiate private network addresses for initiating tunneling associations through private and/or public networks
KR100360274B1 (ko) * 2000-12-30 2002-11-09 엘지전자 주식회사 Ｎａｔ 기반 로컬망에서 범용 ｉｐ 전화통신 시스템을지원하는 방법
CN1180573C (zh) * 2001-08-29 2004-12-15 华为技术有限公司 Ip网络系统中的节点跨区域呼叫方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020042832A1 (en) * 2000-08-14 2002-04-11 Fallentine Mark D. System and method for interoperability of H.323 video conferences with network address translation
KR20010092015A (ko) * 2001-09-07 2001-10-24 변진우 고속 무선 인터넷망에서 멀티미디어 통신용 인터넷폰서비스 제공 방법 및 시스템
US20030093563A1 (en) * 2001-10-10 2003-05-15 Young Bruce Fitzgerald Method and system for implementing and managing a multimedia access network device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11290685B2 (en) * 2013-07-03 2022-03-29 Huawei Technolgoies Co., Ltd. Call processing method and gateway

Also Published As

Publication number Publication date
CN100401700C (zh) 2008-07-09
GB0702877D0 (en) 2007-03-28
GB2432078A (en) 2007-05-09
CN1735055A (zh) 2006-02-15
GB2432078B (en) 2008-08-20

Similar Documents

Publication Publication Date Title
US7852859B2 (en) System and method for interfacing legacy IP-PBX systems to SIP networks
US6738390B1 (en) SIP-H.323 gateway implementation to integrate SIP agents into the H.323 system
TWI357749B (fr)
JP3880867B2 (ja) Ｉｐエンドポイント間のｉｐベアラパスを管理するためのｉｐパケットアクセスゲートウェイ（ｉｐｐａｇ）システムおよび方法およびコンピュータプログラム製品
US9036619B2 (en) Systems and methods for a session initiation protocol (SIP) translator
US8130766B2 (en) System and method for implementing multimedia calls across a private network boundary
AU2005201075B2 (en) Apparatus and method for voice processing of voice over internet protocol (VOIP)
KR100377688B1 (ko) 에스아이피-티 오버랩 시그널링을 이용한 호 설정 방법
US20060018308A1 (en) Method and system for supporting global IP telephony system
WO2004034637A1 (fr) Procede et systeme d'interconnexion de teleservices de reseaux heterogenes a large bande
WO2007036160A1 (fr) Appareil, systeme et procede assurant la communication entre un client et un serveur
WO2003030463A1 (fr) Procede et systeme pour la prestation d'un service vocal ip sur un reseau prive
US20130007291A1 (en) MEDIA INTERWORKING IN IPv4 AND IPv6 SYSTEMS
JP2004524755A (ja) ＶｏＩＰシステム
JP4757438B2 (ja) ネットワーク、構内交換機及びそれに用いるマルチプロトコル通信端末制御方法
US20040260824A1 (en) Internet telephony call agent
WO2006015525A1 (fr) Procede d'appel point a point entre deux terminaux multimedia dans le reseau prive
CN101631084B (zh) 实现媒体控制流报文穿越网络地址转换器的方法及系统
WO2009121267A1 (fr) Procédé et appareil pour réaliser une traduction d'adresse réseau (nat)
US6901080B1 (en) System and method for providing an intermediary layer for VoIP call pipe establishment
US8374178B2 (en) Apparatus and method for supporting NAT traversal in voice over internet protocol system
WO2006119683A1 (fr) Procede d'implementation de traversee nat mms
CA2544154A1 (fr) Methode et appareil permettant la resolution dynamique des problemes d'interfonctionnement de protocoles pour des extremites diverses
JP2005252809A (ja) Ｉｐ電話用構内システム及び通話転送方法
JP5158588B2 (ja) ＳＩＰ電話機、ＶｏＩＰシステム及びそれらに用いる同一ネットワーク内通信方法並びにそのプログラム

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
ENP Entry into the national phase

Ref document number: 0702877

Country of ref document: GB

Kind code of ref document: A

Free format text: PCT FILING DATE = 20050222

NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 0702877.2

Country of ref document: GB

122 Ep: pct application non-entry in european phase