This statement in the ComputerWorld article about Sprint and AT&T Mobile offering next generation conferencing services from UberConference and Cisco is really all about. Net neutrality and parity.
Because of this over-the-top services debacle, the net neutrality debate takes on greater meaning. If carriers can offer their own content and services on their own networks, they don't have to worry as much about whether they are throttling somebody's else's third party service, and they don't have to levy a higher charge on that third party to give its service greater priority on a busy network.
What this also means is interconnection agreements between the carriers and the mobile operators also need to be honored. Thus if data traffic between Sprint and AT&T have to be treated the same as if they were on each other's owned and operated network, a call to Uber Conference from AT&T over the mobile app (if Uber offers this) would have to be as if it was ending up on AT&T and vice versa. This is a very important point and fact as we migrate from circuit switched voice to LTE Voice and VoLTE.