A suggestion
 

I find one feature very useful which is not evident in Voxalot.
If only it could show us the real IP address(s) of the devices registered (after login in of course).
This is done in Sipphone/Gizmo account and I use it often to find the real IP address for the purpose of managing/configuring the device from another location, this requires me to have at least one device registered with Sipphone. I know that I can use services such as DDNS, but this relies yet on another aspect of config and some ATA does not have this feature.

And this feature could be part of premium service of course.