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
Br, Wangji
Hi,
the STUN's procolls aim is to discover behind which kind of NAT device you are. Behind a firewall it will usually tell you that youre behind a "blocked" connection type because a "real" firewall tends to have a strict ruleset which will prevent the incoming RTP/UDP voice stream to get through it.
If you have a firewall setup the only clean solution is to install a SIP aware proxy either on the firewall or install a seperate SIP (+RTP/UDP) forwarding proxy in the DMZ.
-- Arnd
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Arnd Vehling -
wangji