SIP 中不带端口号的 rport 是什么意思
当你有类似这样的 SIP Via: 头时
sip_via_example.txt
Via: SIP/2.0/UDP 95.117.121.206:18050;rport;branch=z9hG4bKabc123rport 参数表示响应接收请求的端口
这在 NAT 遍历情况下非常有用，因为你事先不知道数据包将被映射到哪个出站 NAT 端口。
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