You are right installers should not be adjusting other VRS equipment. Okay it is like this - I have a Verizon Phone and if I need to call information - who do I get Verizon's Information desk - and they bill me 1.00 for every time I call information. Now I would rather to call maybe Sprint Information because they may be cheaper .75 cents but I can't because their technology based on their devices were DESIGNED for them and for them only.
And most of all you CHOSE to have Sorenson equipment then you are ACCEPTING the choice so quit the whining. If you don't like it then DON'T use Sorenson equipment then they will lose money and use other providers. If this is such a big deal - then don't get Sorenson and send the video camera back and use the DLINK which provides opporunity with other VRS.