Is stun.3cx.com working? I have been struggling to make connections between external extensions work for the last 3 hours. I had no sound, and the connection kept dropping after a while (15 to 30 seconds) although NAT is OK and all lines are set "external" (no media server binding). I needed to change the stun server from stun.3cx.com in order to successfully make it work... Have others noticed some kind of a problem with this? I have created an installable version of a softphone for my colleagues, which uses this stun server, I guess I need to change that?