I am back with Vonage for our VOIP. It does not integrate with LMCE in any way, but it works. It is advertised as "not for nerds" (you can't even use an IP phone) which obviously is not what we want, but SWMBO is happy with it. I will explore other VOIP providers that WILL integrate with LMCE in due course, but for now we are sticking with Vonage.
The problem: When there are torrents or other downloads running, all priority is given to the downloads, which ruins the call quality if the phone is in use. Is there any way to dedicate bandwidth to the Vonage box when it needs it?
By the way, Vonage have changed their box since I was last with them. You are supposed to plug it directly into the Internet, but I have not done this. I understand this is a HUGE no-no in the world of LMCE, but maybe this problem would go away if I did set it up like that. I just don't want to over-complicate things for when I start looking at other VOIP providers. Maybe I will try it in the name of science, just to see what IP the Vonage box spits out.