Give a fellow a little warning before conjuring those names! When it became clear that packet switching was going to win out, did the telcos ever try to emulat

Give a fellow a little warning before conjuring those names! When it became clear that packet switching was going to win out, did the telcos ever try to emulate circuits with UDP flows or similar? It seems like IP over switched circuits would look a lot like virtual switched circuits over IP, if you squint just right.