Everyone assumes it was TT. But according to Favre, he and TT remained in contact, but it was M3 with whom it took longer to mend:

Quote Originally Posted by Favre
In fact, he said he and Thompson, who was a Packers scout when the team acquired Favre in a 1992 trade, kept in contact even after he was traded to the Jets and went on to play for the Vikings. Favre also said he and McCarthy resumed communication after Favre's final retirement following the 2010 season and that his relationship with current quarterback Aaron Rodgers is good.

"Every time I played against Ted or when I was with the Jets and threw six touchdown passes against the Cardinals, which was the only time in my career I ever did that, Ted sent me a message," Favre said. "It was always, 'Nice job. Congratulations. Amazing game.' The day that I left in my meeting with Ted, he has a way of killing you with kindness. He doesn't say a lot, but I've known Ted ever since I got to Green Bay and always got along with him. I can't say that things were mended [at that point], but I responded to texts in a polite way myself. And Mike, there came a point where he and I started exchanging messages, I think it was after I got done playing."
I thought that very interesting and would have assumed the reverse. Yes, I know he said it wasn't mended yet with TT, but at least they were still in touch.

Apologies for not ammending this to the Favre thread. I was too lazy to look for it.