信令流程 signaling process
信令流量管理功能 Signaling Traffic Management Functions
信令流和消息内容 Signalling flows and message contents
信令流检测 Signaling-detection
信令电流 signaling current
信令业务流量控制 Signaling Traffic Control
交流信令AC信令 alternating current signalling AC signalling
直流信令DC信令 direct current signalling DC signalling
要让使用私有ip地址的用户通过SIP协议进行会话，就必须使SIP的信令流和媒体流穿越NAT，而其中的难点是媒体流的穿越。
Only when the control and media flow traverse NAT, can people use private IP address to make sessions with SIP protocol.
在软交换网络体系中，IP中继媒体网关完成电路交换网侧与IP分组网络侧媒体流的转换，同信令网关一起完成电路交换网与IP网络的互通。
Trunking Media Gateway transmits media stream between IP and circuit switching networks, implements interworking of IP and circuit switching networks with signaling gateway in Softswitch network.
本文探讨了SIP协议性能测试方法与评价标准，提出了基于基本呼叫流程的测试方案，并对测试方案中SIP信令和媒体流的NAT穿越问题作了深入的分析。
This thesis discusses SIP performance test method and criterion, putting forward test schemes based on basic call flows and analyzing the problem of SIP signaling and media stream traversing the NAT.
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