There’s a minor bug in the Extensions module of 220.127.116.11. When you add a new extension, Generic SIP Device, my browser reports “Done, but with errors on page.”
I assume this is leftover from the bug that caused a completely blank page when you tried to add an extension. I don’t know if this impacts functionality. Also, broswer reports java scripting error when I highlight tooltips (they still come up, though).