I don't know. I recall several coaches going public with the fact that tOSU was calling their verbally committed kids and that this was a no-no. the B1G was asked and said that there are no such rules until an LOI is signed. I believe it was to leave kids alone as many commit so that they are not hounded by coaches sleeping in their cars at the curb to catch the kid when he was waiting for the bus in the morning. It was back when coaches actually had a soul and set the kid's welfare as a priority.
I don't recall the details but am 100% sure this was a "thing" for urban.
A quick google
search came up with several articles. Seems it was the current ILL coach, BB, when he was at Wisconsin. But there was more than just him.