Selling a few bits and bytes to people who want to talk over it. . .

The “history repeated” part . . .
In the US – after MCI lead the way with their “shared private” system
from Chicago to St. Louis – -
Companies with communications networks already in place jumped on
the bandwagon of selling long distance telephone calls. Using available
communications capacity.
Western Union and Southern Pacific Corporation (SPC, where the Sprint
tradename comes from) where two of the notables.

So it would not be an unprecedented business move to put VoIP on your
existing capacity digital network. Just wait for GM to get the idea.
(GM's private network is second in capacity to only the Defense Comm. Agency).

Selling a few bits and bytes to people who want to talk over it. . .

The “history repeated” part . . .
In the US – after MCI lead the way with their “shared private” system
from Chicago to St. Louis – -
Companies with communications networks already in place jumped on
the bandwagon of selling long distance telephone calls. Using available
communications capacity.
Western Union and Southern Pacific Corporation (SPC, where the Sprint
tradename comes from) where two of the notables.

So it would not be an unprecedented business move to put VoIP on your
existing capacity digital network. Just wait for GM to get the idea.
(GM's private network is second in capacity to only the Defense Comm. Agency).