[Serusers] Is STUN protocol usable behind firewall?
wangji at bjut.edu.cn
Fri Feb 20 17:22:06 CET 2004
In my test environment there are a firewall between SER server and SIP terminal(But I am not sure). I think so because in this envirmonent SJPhone can not register to SER server (I use ethereal on SER server and can't find register packets from SJPHONE). I had tested SJPHONE behind a NAT created by cisco router and success. So I think that thing is a firewall.
Today I test X-Lite in the same environment with same setting but it works. I get the UDP packet by ethereal. I find it send packet to xtunnel.xten.net port 3478/3479. These ports are used by STUN protocol. I would why it works.
Attached file can be open by ethereal. In the file no reponse register is sent by SJPhone and those success is sent by X-Lite. The file is bigger than 40K so I compress it by WinRAR.
I trying X-Lite again and it says the firewall is port restricted single mapped port system. What's that means?
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