边缘业务接入网关的研究与实现
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摘要
边缘业务接入网关最基本的功能是解决用户端防火墙／地址转换设备穿越问题，并利用设备组网的屏蔽功能实现软交换核心网络的安全保护。此设备还在发展中，设备的功能也在不断更新和完善，目前需要考虑的功能主要有：互通、安全、接入控制。
针对边缘业务接入网关的接入和互通的功能，本论文中主要论述了VoIP电话网关的实现和针对该网关的FW／NAT穿越两部分内容。前一部分着重描述了ORTP协议栈的移植及VoIP电话网关中语音处理部分的实现。同时由于IPv4地址的匮乏以及出于安全的考虑，存在大量的使用地址转换技术的局域网，当语音网关放置于局域网内时，会出现通话不能建立的现象，论文的第二部分主要针对基于SIP协议的VoIP电话网关处于私网内时遇到的通话不能建立的问题描述了地址转换设备／防火墙的穿越的实现方案，以及编程实现。
Solution of NAT/FW traversing is the main function of border service access gateway . The border service access gateway shielded the topology of private network.in another word ,The core component of a soft switch network is protected by the border service access gateway . The gateway is still a developing entity.its main function are interconnection,security and access control.
The paper is divided into three chapters, introduces the present solutions of firewall/network address translation traversing and practical application of jitter buffer to solve time delay jitter of voice packet.
The first part mainly describes porting of the ORTP stack from linux platform to vxworks and implementation of RTP related subsystem of the VoIP gateway . another part of the paper give a brief introduction to implementation of Cone/Symmetry NAT tunnel for SIP and RTP , and firewall traversing when the VoIP gateway is placed in private network .
针对边缘业务接入网关的接入和互通的功能，本论文中主要论述了VoIP电话网关的实现和针对该网关的FW／NAT穿越两部分内容。前一部分着重描述了ORTP协议栈的移植及VoIP电话网关中语音处理部分的实现。同时由于IPv4地址的匮乏以及出于安全的考虑，存在大量的使用地址转换技术的局域网，当语音网关放置于局域网内时，会出现通话不能建立的现象，论文的第二部分主要针对基于SIP协议的VoIP电话网关处于私网内时遇到的通话不能建立的问题描述了地址转换设备／防火墙的穿越的实现方案，以及编程实现。
Solution of NAT/FW traversing is the main function of border service access gateway . The border service access gateway shielded the topology of private network.in another word ,The core component of a soft switch network is protected by the border service access gateway . The gateway is still a developing entity.its main function are interconnection,security and access control.
The paper is divided into three chapters, introduces the present solutions of firewall/network address translation traversing and practical application of jitter buffer to solve time delay jitter of voice packet.
The first part mainly describes porting of the ORTP stack from linux platform to vxworks and implementation of RTP related subsystem of the VoIP gateway . another part of the paper give a brief introduction to implementation of Cone/Symmetry NAT tunnel for SIP and RTP , and firewall traversing when the VoIP gateway is placed in private network .
引文
1) 陈建亚，余浩．软交换与下一代网络．北京：北京邮电大学出版社，2003
2) 赵慧玲，叶华，等．以软交换为核心的下一代网络技术．北京：人民邮电出版社，2002
3) SIP:Session Initiation Protocol. Internet Engineering Task Force Internet Draft. October 26,2001
4) 陈志刚．NAT地址转换进阶．华为技术有限公司，2002(8)
5) 糜正琨，王文鼎．软交换技术与协议．北京：人民邮电大学出版社，2002
6) 王卫军．NGN协议介绍．华为技术报，2002(3)
2) 赵慧玲，叶华，等．以软交换为核心的下一代网络技术．北京：人民邮电出版社，2002
3) SIP:Session Initiation Protocol. Internet Engineering Task Force Internet Draft. October 26,2001
4) 陈志刚．NAT地址转换进阶．华为技术有限公司，2002(8)
5) 糜正琨，王文鼎．软交换技术与协议．北京：人民邮电大学出版社，2002
6) 王卫军．NGN协议介绍．华为技术报，2002(3)