Just spent a half-hour or so playing around with the X-Lite soft phone, getting it to run under Wine. The good news is that it works. The bad news is you may be limited to running it under KDE. It works under AfterStep but sometimes the menus don't pop up properly and it attempts to use a couple "hooks" in AfterStep that aren't there. It works under KDE but KDE isn't exactly my favorite WM.