注意：stun.xten.com，已經down了。如果你的ATA用了這個，換一個吧。

最近看到很多人用這個stun: stun.xten.com,最好換一個。

據這個帖子：
http://www.dslreports.com/forum/r23088225-Why-does-only-Callcentric-work-well-with-Sipsorcery

“
There's currently no STUN server running at either stunserver.org or stun.xten.com. However, there are plenty of other sites running STUN servers. Here's a short list of servers that are currently up and running:

stun.voipbuster.com
stun01.sipphone.com
stun.ekiga.net
stun.ideasip.com
stun.rnktel.com
stun.sipgate.net
stun.sipgate.net:10000
stun01.sipphone.com
stun.softjoys.com
numb.viagenie.ca
stun.voxalot.com
“