Report - 1、SIP协议介绍read.pudn.com/downloads99/doc/404124/sip_ch.doc · Web viewVia头域中，maddr,ttl,和sent-by字段会在transport层处理请求的时候设置（18节）。Via在proxy的处理在16.6节8段和16.7节3段描述。8.1.1.8

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