有没有对SDP协议熟悉的，请高手帮忙解释下为什么这么多candidate？

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有没有对SDP协议熟悉的，请解释下为什么这么多candidate？各个candidate之间的关系？

a=candidate:2tzSivLxI 1 udp 2130706175 192.168.0.153 43502 typ host
a=candidate:2tzSivLxI 2 udp 2130706174 192.168.0.153 43503 typ host
a=candidate:kxBAZez4r 1 udp 2130705919 10.85.92.46 43294 typ host
a=candidate:kxBAZez4r 2 udp 2130705918 10.85.92.46 43295 typ host
a=candidate:srflx2tzS 2 udp 1694498814 104.238.161.114 43503 typ srflx raddr 192.168.0.153 rport 43503
a=candidate:srflxkxBA 1 udp 1694498815 104.238.161.114 43294 typ srflx raddr 10.85.92.46 rport 43294
a=candidate:srflxkxBA 2 udp 1694498814 104.238.161.114 43295 typ srflx raddr 10.85.92.46 rport 43295
a=candidate:srflx2tzS 1 udp 1694498815 104.238.161.114 43502 typ srflx raddr 192.168.0.153 rport 43502