A route-based talk initialization protocol transparent transmission network address conversion method

A network address translation and initialization protocol technology, which is applied in the field of computer networks, can solve the problems of low storage utilization and analysis processing efficiency of gateway equipment, and achieve the effect of maintaining scalability and flexibility and improving computing efficiency

Inactive Publication Date: 2007-10-24
INST OF COMPUTING TECH CHINESE ACAD OF SCI
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Problems solved by technology

[0011] The purpose of the present invention is to solve the many restrictions on the network topology and application system when the session initialization protocol is used to traverse the network address translation using the traditional solution, and it also helps to solve the problem of low storage utilization and analysis and processing efficiency of the gateway device. Purpose, the present invention provides an efficient and transparent method for transparently traversing network address translation based on route-based session initiation protocol

Method used

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  • A route-based talk initialization protocol transparent transmission network address conversion method
  • A route-based talk initialization protocol transparent transmission network address conversion method
  • A route-based talk initialization protocol transparent transmission network address conversion method

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Embodiment Construction

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings. It should be pointed out that the described embodiments are only considered for the purpose of illustration and not limitation of the present invention.

[0030] Fig. 1 is a schematic diagram of the method for transparently traversing network address translation based on the route-based session initialization protocol of the present invention using the Record-Route stack design analysis replacement algorithm, taking the Record-Route header field analysis as an example to introduce the analysis process of the "stack mode";

[0031] Fig. 2 is the method flow chart of the Record-Route header domain analysis algorithm based on the route-based session initiation protocol transparent traversal network address translation of the present invention, which is the processing flow of the summarized Record-Route header domain;

[0032] The header field field is the basic unit of an...

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Abstract

The disclosed route-based transparent-passing NAT method for SIP comprises: combining the SIP and network topology with NAT, analyzing the received Sip message, building stack for the route relative head domain field for storing the IP address of SIP message route; locating the SIP nodes near NAT in stack, and building the mapping item for first-appeared node in NAT table; when message coming, taking IP address substitution according to built NAT mapping. This invention improves system performance, and can be used in different NAT network topologies.

Description

technical field [0001] The invention belongs to the technical field of computer networks, and relates to a method for transparently traversing network address translation based on route-based session initiation protocol. Background technique [0002] A session (Session) refers to the data exchange process between users. A large number of applications on the Internet need to use the session creation and management functions. This is also the original intention of the IETF to propose the Session Initiation Protocol (Session Initiation Protocol, referred to as the Session Initiation Protocol). In the network protocol architecture defined by the IETF, the SIP protocol is an application layer protocol located above the transport layer. By carrying an optional SDP (Session Description Protocol) payload, the SIP protocol can easily open / close sessions, negotiate Session parameters, establishing data exchange flows, and managing sessions. [0003] Four network elements are defined ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L45/741
Inventor 陈沫蔡嘉勇李丹
Owner INST OF COMPUTING TECH CHINESE ACAD OF SCI
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