This problem is due to your provider. Some providers reject calls if the PDUs come from different ports. And this is what Ekiga is doing.
I will try to contact my provider because I guess that Ekiga is sip conform and so the provider needs to adopt its configuration. But I'm also not an expert. I just found this explanation during my own research on the web. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is a bug assignee. https://bugs.launchpad.net/bugs/120251 Title: "security check failed" -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
