Implementing method of SIP application-level gateways based on NAT-PT

A technology of application layer gateway and implementation method, which is applied in the direction of data exchange network, digital transmission system, electrical components, etc., can solve the problem of address exhaustion, and achieve the effect of realizing management and realizing state
CN101257435AInactive Publication Date: 2008-09-03上海亿人通信终端有限公司
0 Cites 13 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
上海亿人通信终端有限公司
Publication Date
2008-09-03
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

Disclosed is a method for applying a NAT-PT-based SIP onto the gateway to convert SIP message between an IPv4 network and an IPv6 network, comprising: obtaining the identification number and length of the SIP message; analyzing the first line of the message head to judge whether the type of the SIP message is a request or a response; if the answer is request, executing the request process; if the answer is response, executing the response process. The invention can record the conversion of the IP address and the port via a conversion information table, manage the conversion state of the message by a state machine, and carry out the conversion from the IPv4 address to IPv6 address (or visa versa) based on an address prefixing and an address pool, accordingly, the conversion between the IPv4 network and IPv6 network is achieved.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a method for converting SIP (sessioninitiation protocol, session initiation protocol) messages between an IPv4 network and an IPv6 network, in particular to a SIP application layer based on NAT-PT (Network Address Translation-Port Translation Protocol) Gateway (SIP ALG) implementation method. Background technique

[0002] SIP is an IP telephony signaling protocol proposed by the IETF (internet engineering task force) organization. SIP is a text-based client / server communication protocol, and SIP messages include request messages and response messages. Both have the same message format, and both message types consist of a start line, one or more header fields, and an optional message body:

[0003] In the start line (also known as the request line) of a request message, SIP defines the operation requested to be performed. SIP provides users with an expanded set of functions. So far, the version has defined: invitation (INVITE...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More