[Serusers] Is STUN protocol usable behind firewall?

wangji wangji at bjut.edu.cn
Fri Feb 20 17:08:45 CET 2004

Hi all,
    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

-------------- next part --------------
A non-text attachment was scrubbed...
Name: trans_firewall01.cap
Type: application/octet-stream
Size: 53737 bytes
Desc: not available
URL: <http://lists.sip-router.org/pipermail/sr-users/attachments/20040221/6c425456/attachment.obj>

More information about the sr-users mailing list