WO2012109865A1 - Procédé, dispositif et système de traitement nat pour des appels entre les clients d'un réseau privé et les clients ne faisant pas partie d'un réseau - Google Patents

Procédé, dispositif et système de traitement nat pour des appels entre les clients d'un réseau privé et les clients ne faisant pas partie d'un réseau Download PDF

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Publication number
WO2012109865A1
WO2012109865A1 PCT/CN2011/077828 CN2011077828W WO2012109865A1 WO 2012109865 A1 WO2012109865 A1 WO 2012109865A1 CN 2011077828 W CN2011077828 W CN 2011077828W WO 2012109865 A1 WO2012109865 A1 WO 2012109865A1
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WO
WIPO (PCT)
Prior art keywords
private network
port
client
network address
nat
Prior art date
Application number
PCT/CN2011/077828
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English (en)
Chinese (zh)
Inventor
简其平
金龙
Original Assignee
华为技术有限公司
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 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201180001375.4A priority Critical patent/CN102318323B/zh
Priority to PCT/CN2011/077828 priority patent/WO2012109865A1/fr
Publication of WO2012109865A1 publication Critical patent/WO2012109865A1/fr

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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
    • 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
    • H04L61/2585—NAT traversal through application level gateway [ALG]

Definitions

  • the present invention belongs to the field of communication technologies, and specifically relates to a NAT processing method, a NAT device, and a calling system for calling between a private network client and an out-of-network client.
  • VoIP Voice over Internet Protocol
  • NAT Network Address Translation
  • FW Fire Wall
  • the proxy server (Proxy Server) is mostly located on the public network, and the client can register with the server on the public network, and the client can only talk to the called client through the proxy server on the public network.
  • the technologies for solving SIP traversal of NAT and FW are mainly classified into two types.
  • the tunnel penetration technology is adopted.
  • the User Datagram Protocol (UDP) of the NAT is simply traversed (Simple Traversal of UDP over NATs, STUN) technology.
  • UDP User Datagram Protocol
  • STUN Simple Traversal of UDP over NATs
  • the embodiment of the invention provides a call between a private network client and an external network client.
  • the NAT processing method, the NAT device, and the call system enable the proxy server and the private network client to traverse NAT and FW on the same private network.
  • a network address translation device processing method for a private network client and an out-of-network client call including:
  • the SIP packet is processed by the network address translation application layer gateway, and according to the mapping relationship, the private network address and port of the SDP part of the SIP packet are converted into a public network address and port.
  • a network address translation device for calling between a private network client and an off-net client comprising a processor and a memory; wherein the processor is configured to: the private network client in the SDP part of the SIP certificate sent by the proxy server The private network address and port of the terminal, the public network address and the port are allocated, and the storage is instructed to store the private network address and the port, and the mapping relationship between the public network address and the port, where the SIP packet is sent to The SIP packet of the out-of-network client; and the network address translation application layer gateway processing of the SIP packet, and converting the private network address and port of the SDP part of the SIP packet into a public network according to the mapping relationship Address and port; the memory is used to save the mapping relationship.
  • a call system between a private network client and an out-of-network client including the network address translation device and the proxy server; and the proxy server, after receiving the SIP message of the private network client, passing through the network
  • the address translation device sends a SIP packet to the client outside the network.
  • the NAT device is a private network client in a Session Description Protocol (SDP) part of a SIP message sent by a proxy server.
  • SDP Session Description Protocol
  • the private network address and port are assigned an idle public network address and port, and the mapping relationship is saved, so that subsequent media streams can traverse NAT and FW according to the mapping relationship, thereby solving the problem that the proxy server and the private network client are in the same private network. , unable to traverse the technical problems of NAT and FW.
  • SDP Session Description Protocol
  • FIG. 1 is a schematic flowchart of a method for processing a NAT device of a private network client calling an out-of-network client according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of a method for processing a NAT device for a private network client and an out-of-network client to provide a call according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a data flow of a private network client calling an off-net client provided by an embodiment of the present invention
  • FIG. 4 is a schematic flowchart of a method for processing a NAT device of an off-net client calling a private network client according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a data flow of an off-network client calling a private network client according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of a calling system of a private network client and an out-of-network client according to an embodiment of the present invention.
  • Example 1 The method for processing the network address translation device of the private network client and the external network client provided by the embodiment of the present invention implements the traversal of the NAT and the FW when the proxy server and the private network client are on the same private network, as shown in FIG. 1 , including The following steps:
  • the NAT device is a private network address and port of the private network client in the SDP part of the SIP message sent by the proxy server, allocates a public network address and port, and saves the private network address and port, and the public network address and port. , the mapping relationship between .
  • the SIP packet is a SIP packet sent by the proxy server after receiving the SIP packet of the private network client.
  • the SIP message can be a call request message or a response message.
  • the source IP address of the SIP packet is the address of the proxy server, and the address and port in the SDP part are the private network address and port of the private network client.
  • the SIP 4 message is a SIP message sent to the client outside the network.
  • the NAT device cannot perform NAT ALG on the SDP part of the SIP packet according to the application level gateway (ALG). Therefore, the NAT device obtains the private network address and port of the private network client in the SDP part of the SIP 4 file, allocates an idle public network address and port to the private network client, and saves the private network address and port of the private network client. And the mapping relationship between the public network address and the port assigned to the private network client.
  • the NAT device also performs NAT processing on the media stream according to the mapping relationship.
  • S102 performing NAT ALG processing on the SIP packet, and according to the mapping between the private network address and the port, and the public network address and the port, the private network address and port of the SDP part of the SIP packet Convert to public network address and port.
  • the NAT device performs NAT on the SIP packet sent by the proxy server.
  • the private network address and port of the private network client in the SDP part of the SIP 4 are translated into the public network address and port according to the above mapping relationship.
  • the NAT device can also perform ALG processing on the from, to, and other fields in the SIP packet.
  • the NAT device allocates an idle public network address and port to the private network address and port of the private network client in the SDP part of the SIP packet sent by the proxy server, and saves the mapping relationship so that the subsequent media stream can traverse the NAT according to the mapping relationship.
  • FW thus solving When the proxy server and the private network client are on the same private network, the technical problems of NAT and FW cannot be traversed.
  • the embodiment of the present invention is a detailed description of a specific application scenario of the embodiment 1.
  • the SIP 4 message is a call request message.
  • the NAT device processing method includes the following steps:
  • the private network client such as client A
  • the off-net client such as client B
  • the out-of-network client can be a public network client or a private network client behind another NAT device.
  • the data part of the registration message sent by the private network client carries the address and port of the private network client when the call is initiated, so the proxy server can obtain the address and port from the registration message.
  • the data part of the registration message sent by the out-of-network client carries the address and port when the out-of-network client initiates the call, so the proxy server can obtain the address and port from the registration.
  • the NAT device sends a call request to the proxy server, for example, the private network address and port of the private network client in the SDP part of the Invite, and the public network address and port are allocated, and the private network address and port are saved. , and the mapping between public network addresses and ports.
  • the Invite message is sent by the proxy server after receiving the Invite message from the private network client, and the source IP address of the Invite packet is the address of the proxy server, in the SDP part.
  • the address and port are private network addresses and ports of the private network client.
  • the source IP address of the Invite packet is different from the address in the SDP part, and the NAT device cannot perform NAT ALG on the SDP part of the Invite packet according to the normal ALG mode. Therefore, the NAT device obtains the private network address and port of the private network client in the SDP part of the Invite packet, allocates an idle public network address and port to the private network client, and saves the private network address and port of the private network client, and The mapping between the public network address and port assigned to the private network client.
  • the NAT device also pairs the mapping according to the mapping relationship. The media stream is NAT processed.
  • S202 Perform NAT ALG processing on the Invite packet, and convert the private network address and port of the SDP part of the Invite packet to the private network address and the port and the mapping between the public network address and the port. Public network address and port.
  • the NAT device performs NAT on the Invite packet sent by the proxy server. Convert the private network address and port of the private network client in the SDP part of the Invite 4 to the public network address and port according to the above mapping relationship.
  • the NAT device can also perform ALG processing on the from, to, and other fields in the Invite packet.
  • the response message may be a 200 OK message.
  • the NAT device allocates an idle public network address and port to the private network address and port of the private network client in the SDP part of the Invite packet sent by the proxy server, and saves the mapping relationship so that the subsequent media stream can traverse the NAT according to the mapping relationship.
  • FW which solves the technical problem that the proxy server and the private network client cannot traverse NAT and FW when they are on the same private network.
  • the embodiment of the present invention is a specific description of another specific application scenario of the first embodiment.
  • the SIP 4 message is a response message, and the NAT is used.
  • the device processing method includes the following steps:
  • the private network client such as client A
  • the extranet client such as client B
  • the specific registration process is the same as the registration process described in embodiment 2. .
  • the NAT device performs NAT processing on the call request message sent by the out-of-network client to the proxy server.
  • the call request can be Invite 4.
  • S302 The private network address and port of the private network client in the SDP part of the response packet sent by the proxy server, the public network address and the port are allocated, and the private network address and port, and the public network address and the port are saved. Mapping relations. Where the response is 4 After receiving the response packet from the private network client in response to the call request packet, the proxy server sends a response packet, the source IP address of the response packet is the address of the proxy server, and the address and port in the SDP part are private networks. The private address and port of the client.
  • the response message may be a 200 OK message.
  • the NAT device cannot perform NAT ALG on the SDP part of the 200 OK packet according to the normal ALG mode. Therefore, the NAT device obtains the private network address and port of the private network client in the SDP part of the 200 OK packet, allocates an idle public network address and port to the private network client, and saves the private network address and port of the private network client, and The mapping between the public network address and port assigned to the private network client.
  • the NAT device also performs NAT processing on the media stream according to the mapping relationship.
  • S303 Perform NAT ALG processing on the 200 OK packet, and convert the private network address and port of the SDP part of the 200 OK packet according to the mapping relationship between the private network address and the port and the public network address and the port. It is the public network address and port.
  • the NAT device performs NAT on the 200 OK sent by the proxy server. Convert the private network address and port of the private network client in the SDP part of the 200 OK file to the public network address and port according to the above mapping relationship.
  • the NAT device can also perform ALG processing on the from, to, and other fields in the 200 OK message.
  • the NAT device allocates an idle public network address and port to the private network address and port of the private network client in the SDP part of the 200 ⁇ ⁇ 3 ⁇ 4 text sent by the proxy server, and saves the mapping relationship so that the subsequent media stream can traverse according to the mapping relationship.
  • NAT and FW solve the technical problem that the proxy server and the private network client cannot traverse NAT and FW when they are on the same private network.
  • a network address translation device for calling between a private network client and an out-of-network client provided by the embodiment of the present invention includes a processor and a memory.
  • the NAT device provided by the embodiment of the present invention is a router or a switch.
  • the processor is a private network address and port of the private network client in the SDP part of the SIP message sent by the proxy server, allocates a public network address and a port, and instructs the memory to save the above The mapping between the private network address and port, and the public network address and port.
  • the processor is further configured to perform NAT processing on the media stream according to a mapping relationship saved by the memory when receiving the media stream between the private network client and the external network client.
  • the SIP packet is a SIP packet sent by the proxy server after receiving the SIP packet of the private network client.
  • the source IP address of the SIP packet is the address of the proxy server, and the address and port in the SDP part are private.
  • the SIP 4 message is a SIP message sent to the client outside the network.
  • the processor performs NAT ALG processing on the SIP packet, and converts the private network address and port of the SDP part of the SIP packet into a public network address and port according to the mapping relationship stored in the memory.
  • the processor of the NAT device allocates an idle public network address and port to the private network address and port of the private network client in the SDP part of the SIP packet sent by the proxy server, and saves the mapping relationship in the memory to make the subsequent media stream.
  • the NAT and FW can be traversed according to the mapping relationship in the memory, thereby solving the technical problem that the proxy server and the private network client cannot traverse NAT and FW when they are on the same private network.
  • the calling system of the private network client and the out-of-network client provided by the embodiment of the present invention includes the NAT device and the proxy server in the foregoing Embodiment 4; and the proxy server is configured to receive the SIP of the private network client. After the packet is sent, the NAT device sends a SIP packet to the client outside the network.
  • the NAT device allocates a public network address and port to the private network address and port of the private network client in the SDP part of the SIP packet sent by the proxy server, and saves the private network address and port, and the public network address and port. Mapping relations.
  • the SIP 4 message is a SIP message sent by the proxy server after receiving the SIP message of the private network client.
  • the SIP message can be a call request message or a response message.
  • the source IP address of the SIP "3 ⁇ 4" is the address of the proxy server, and the address and port in the SDP part are the private network address and port of the private network client.
  • the NAT device cannot perform the SDP part of the SIP packet according to the normal ALG mode. NAT ALG. Therefore, the NAT device obtains the private network address and port of the private network client in the SDP part of the SIP packet, allocates an idle public network address and port to the private network client, and saves the private network address and port of the private network client, and The mapping between the public network address and port assigned to the private network client.
  • the NAT device also performs NAT processing on the media stream according to the mapping relationship.
  • the NAT device performs NAT ALG processing on the SIP message, and according to the mapping relationship between the private network address and the port, and the public network address and the port, the private network address and port of the SDP part of the SIP message. Convert to public network address and port.
  • the NAT device performs NAT on the SIP packet sent by the proxy server.
  • the private network address and port of the private network client in the SDP part of the SIP 4 are translated into the public network address and port according to the above mapping relationship.
  • the NAT device can also perform ALG processing on the from, to, and other fields in the SIP packet.
  • the NAT device allocates an idle public network address and port to the private network address and port of the private network client in the SDP part of the SIP packet sent by the proxy server, and saves the mapping relationship so that the subsequent media stream can traverse the NAT according to the mapping relationship.
  • FW which solves the technical problem that the proxy server and the private network client cannot traverse NAT and FW when they are on the same private network.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Small-Scale Networks (AREA)

Abstract

La présente invention appartient au domaine technique des communications. Dans l'un de ses modes de réalisation, la présente invention se rapporte à un procédé, à un dispositif et à un système de traitement NAT pour des appels entre les clients d'un réseau privé et les clients ne faisant pas partie d'un réseau. La solution technique de la présente invention est apte à résoudre le problème technique lié à l'incapacité de passer au travers d'un système NAT et d'un système FW quand un serveur proxy et un client d'un réseau privé se trouvent dans le même réseau privé. Le procédé de traitement mis en œuvre pour le dispositif NAT selon l'invention consiste : à attribuer une adresse libre d'un réseau public et un port à l'adresse de réseau privé et au port du client du réseau privé dans la partie SDP d'un paquet SIP envoyé par un serveur ; à enregistrer la relation de mappage ; à réaliser un traitement NAT ALG sur le paquet SIP ; et à convertir l'adresse du réseau privé et le port dans la partie SDP du paquet SIP de sorte à obtenir l'adresse du réseau public et le port sur la base de la relation de mappage. Le dispositif NAT comprend un processeur et un dispositif de stockage pour accomplir les fonctions susmentionnées. Le système d'appel comprend le dispositif NAT et le serveur proxy. La présente invention peut être utilisée pour mettre en œuvre une communication téléphonique dans un réseau.
PCT/CN2011/077828 2011-07-30 2011-07-30 Procédé, dispositif et système de traitement nat pour des appels entre les clients d'un réseau privé et les clients ne faisant pas partie d'un réseau WO2012109865A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201180001375.4A CN102318323B (zh) 2011-07-30 2011-07-30 私网与网外客户端之间呼叫的nat处理方法、设备和系统
PCT/CN2011/077828 WO2012109865A1 (fr) 2011-07-30 2011-07-30 Procédé, dispositif et système de traitement nat pour des appels entre les clients d'un réseau privé et les clients ne faisant pas partie d'un réseau

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Application Number Priority Date Filing Date Title
PCT/CN2011/077828 WO2012109865A1 (fr) 2011-07-30 2011-07-30 Procédé, dispositif et système de traitement nat pour des appels entre les clients d'un réseau privé et les clients ne faisant pas partie d'un réseau

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