The same flow shown in the proposal deck, running live above. Step two — reaching AppsCom at all — is the one piece that depends on carrier interconnection.
Use the toggle above the demo phone to try both. The number, the call, and the spoken code work exactly the same either way — what differs is what happens the moment the code is spoken.
We manage and rotate our own numbers independently — what we're proposing to build with new carrier partners is interconnection.