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SIP Trunk Gateway NAT traversal solution design and implementation

Author: ChenJing
Tutor: HanTao
School: Huazhong University of Science and Technology
Course: Communication and Information System
Keywords: NAT Traversal SIP Trunk Gateway Session Initiation Protocol Session Description Protocol
CLC: TN915.05
Type: Master's thesis
Year: 2011
Downloads: 17
Quote: 0
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Abstract


In recent years , as companies within the IP-PBX supports SIP deployments as well as a large number of the SIP protocol to provide voice communications infrastructure increasing number of Internet service providers , enterprises urgently need a way to offer similar to the traditional PSTN SIP trunk lines relay technology to enable enterprises to internal and external ITSP IP-PBX through the relay between the direct communication . Enterprises to achieve full network IP , eliminating the need to deploy and maintain traditional PSTN networks. Enterprises of all external communications are referred to ITSP, SIP trunking technology that this SIP Trunk. In this paper, the SIP , SDP protocol basic concept describes their application background , analyzes based on SIP protocol and SDP protocol to establish the basic principles of the session , in order to achieve the SIP Trunk Gateway provides ample theoretical and practical foundation. For NAT / FW -related knowledge were introduced, analyzed the current session is established using SIP signaling NAT traversal problems faced . And by reading a lot of literature on the current use of the advantages and disadvantages of the solutions were analyzed , and on this basis proposed SIP Trunk Gateway 's overall design ideas. In this paper, to achieve SIP through NAT / FW program needs to be considered when the following two points: First, the existing communication devices without any changes ; Secondly, due to a system upgrade will give users a lot of soft hardware auxiliary equipment overhead. Based on these two considerations, for the current session is established using SIP signaling challenges facing NAT traversal , respectively, SIP signaling and SIP signaling load on top of SDP media information is analyzed , described in detail in the specific realization the process of comparison and selection program , elaborated SIP Trunk gateway is how to successfully implement NAT traversal . Its main advantages are as follows : the enterprise's internal network to communicate with external networks , the first gateway through SIP Trunk polymerization , and then by the SIP Trunk gateway to connect with the external network ; right client, without adding any auxiliary peripherals, the market prospects are very good . Finally, the paper of the whole system test plans and test results are analyzed . Test data show that the system meets the design requirements , and can be very good and interoperability between vendors' has broad application prospects.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication network > General issues > Communication network equipment
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