MADISON, Wis. -- The Green Bay Packers have contacted multiple teams about a possible trade for Brett Favre, according to NFL.com.

The Packers are exploring all their options and that means inquiring what teams would be willing to part with for Favre's services.

The key to any trade would revolve around Favre's willingness to go to that team because a trade could happen and he not happy with it and decide not to report, WISC-TV reported.

The Packers are said to have contacted teams in both the AFC and NFC.

In other developments, the Milwaukee Journal Sentinel reported records show Favre used a cell phone issued by the Packers to make repeated calls to Vikings head coach, Brad Childress and offensive coordinator, Darrell Bevell.

The Packers filed tampering charges last week against the Minnesota Vikings, claiming the team had illegal contact with Favre.