[knelson]

When you talk about softphones - these products are just "teasers" so to be speak. The real market is in the switch market, there in lies the key to compatability. Siemens Rolm on their PBX switches have softphone Wifi cards, so all Wifi calls go to the switch and are converted to analog or digital calls and travel over circuits or POTs lines to the other end. So you can be on a normal land line talking with a soft phone. I am sure that with the new internet phone companies public switching will be available.