I found this article from a few years ago. It states "Conference referees call intraconference games, but two teams playing an out-of-conference matchup decide who will supply the officials by agreeing on a contract before the game — in most cases, the onus lies on the road team to supply the referees."
Column | NCAA’s conference-affiliated referee system must go - The Pitt News
Nobody wins when poor officiating decides a thrilling sporting event, and fans come away underwhelmed. Staff writer Griffin Floyd argues the NCAA should reduce...
The following article was tagged in the above one, and makes a lot of sense. OOC games should really have neutral refs.
To avoid conflicts of interest, time has come for neutral referees at nonconference games - CBSSports.com
The practice of visiting teams 'bringing' officials to other campuses has not stood the test of time