SMS Interworking

On SmartMobs an entry was posted describing the plans to have Australian SMS-systems to interwork with US-based non-GSM systems. They intend to use InphoMatch for that.

It is about time that this happens. I am surprised that it did not happen yet. But then, I do not know the state of the interworking business. Are all GSM systems interconnected. Anyway fro telephone interworking is a long time standard, as it it is with Internet mail. It used to be a problem to interwork with non-Internet systems, but I guess that those have died. But there are son many SMS users that I would have guessed that interworking would have been solved years ago. Or is it just that the US is behind?