Worked at a telecom API provider and we were told AT&T still has a handful of these in service in the US. https://www.youtube.com/watch?v=xZePwin92cI https://w

Worked at a telecom API provider and we were told AT&T still has a handful of these in service in the US. https://www.youtube.com/watch?v=xZePwin92cI https://www.youtube.com/watch?v=xZePwin92cI