Digital, yes. IP, unlikely. Given that most of these companies are traditional phone carriers, it is more likely to be ATM (https://en.m.wikipedia.org/wiki/As

Digital, yes. IP, unlikely. Given that most of these companies are traditional phone carriers, it is more likely to be ATM (https://en.m.wikipedia.org/wiki/Asynchronous_transfer_mode https://en.m.wikipedia.org/wiki/Asynchronous_transfer_mode)