Exactly!
Sorenson VP is unique and developed, paid by Sorenson themselves, and it will be UNFAIR for Sorenson to be forced to give away to other VRS, letting other VRS taking advantage of Sorenson work, and money well spent on. Where is the copyright protection? It WILL be unfair *IF* Sorenson blocked all other VRS from giving away their own VP units. This has NOT happened! Sorenson don't mind other VRS giving away free Dlink, therefore how can Sorenson be in monopoly business?
FCC already outlined that ANY VRS have the right to create their own VP unit, designed to work with their VRS system and give away with restriction that limits to their own VRS as only operator.
AT&T of course once was in telephone monopoly business. That is because AT&T did prohibit any other business from going into telephone business for years. Court ordered AT&T to break up their system as punishment for not allowing other companies to compete. I remember that clearly, and yes AT&T made their own devices, and barred other companies from making telephones! That is called Anti-Trust, and this has to be discontinued. Sprint Corp jumped right into the system, create their own network to compete against AT&T, and that is how Sprint became huge company.
Now you see Sprint create their own network, same idea, Any VRS provider CAN create their own system and equipment of their own. HOW MANY VRS are willing to do that? Who stopped them? So far, only Sorenson! Who is at fault? 
NO NO NOT SORENSON!!!!
I am SICK AND TIRED OF PEOPLE WHO ACCUSING SORENSON AS IF THEY ARE IN MONOPOLY BUSINESS, this is COMPLETELY UNTRUE, AND UNCALLED FOR!
