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T.38 , IAF,IUT标准,嵌入式软件

GAO T.38 & IAF (能直接连接在IP网上的传真机)

T.38是ITU为IP网络上的实时传真通信制定的标准。在T.38协议下,来自本地传真机终端的传真信号和数据,在本地网关被打包成像要在IP网上发送的网络传真协议(IFP)包那样。在远端IP网络的网关,从中取出网络转发的IFP有效载荷,然后,或者恢复出要发送至远端传真机的传真信号,或者直接像IAF那样处理这些信号.

图1显示了T.38连接的网络拓扑结构。IP网络上的每个T.38设备,起着网关或者IAF设备的作用。网关能直接连接到传真机,或通过公共电话交换网(PSTN)。该文件中的T.38和传真模块可以连接到网关操作,一起扮演一个IAF的角色,这样就不再需要传真机.

图1:T.38网络拓扑结构

如图4所示,和IP网络的接口由本地网关提供,而且通常不依赖于T.38解决方案。网关使用的标准传输层协议是UDP+RTP, UDP+UDPTL或TCP.

TCP段

在TCP段中,GAO T.38解决方案与图2所示的TCP有效载荷交换IFP包。产生或去除TCP和IP头部,确保TCP分组的妥善传送和错误纠正,这些都是TCP协议栈的职责.

图2:TCP分组

UDP段

在UDP段中,GAO T.38解决方案与包括UDPTL头部,IFP包,以及UDPTL冗余或UDPTL前向纠错在内的应用交换分组。这些分组是如图3所示的UDP有效载荷。UDP协议栈负责生成或去除UDP和IP头部,处理如RTP这些其他的基于UDP的协议。GAO T.38解决方案按照T.38标准处理UDPTL模块的分组排序和错误检测或纠正.

图3:UDP分组

过程初始化

T.38并不包括过程初始化,它必须从外部提供给GAO T.38解决方案。标准段初始化协议包括SIP+SDP和H.323。根据附录D,GAO T.38解决方案有允许配置SDP的接口,便于利用SIP+SDP来初始化T.38段。SIP+SDP栈和T.38网络栈协同工作来管理段.

该图像数据由一个指定的TIFF-F文件提供,该文件格式是T.4(MH或MR)或者T.6(MMR)数据。GAO IAF解决方案可以在这些格式间转换TIFF文件,以匹配远端传真机的性能.

图4:协议结构图

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