回复：Rynga 拨通后无回音，对方能听到，求助帮忙！

来源: 于 2013-02-07 19:20:17 [旧帖] [给我悄悄话] 本文已被阅读：次

That is because sip uses udp 5060 port as connection and 10000-20000 as rtp ports. you need to make sure those ports are open.