A seventh-year veteran, Edwards has started in 33 of 38 games with Buffalo (2007-10), Jacksonville (2010), Oakland, (2011) and Philadelphia, completing 60.6 percent of his passes for 26 touchdowns, 30 interceptions and a passer rating of 75.5.
A third-round pick in 2007, Edwards has compiled a 14-19 record as a starter.
The Bears signed Edwards after adding veteran quarterback Jordan Palmer on Saturday. The team made the moves to bolster the backup quarterback position after No. 3 signal caller Matthew Blanchard broke a knuckle on his non-throwing hand during Thursday's preseason win over the San Diego Chargers.
With the Bears set to play two more preseason games, the staff wants to minimize the risk of injuries for starter Jay Cutler and primary backup Josh McCown. Cutler and McCown are likely to participate in their most significant action of the preseason on Friday, when the Bears face the Oakland Raiders.
When Chicago closes the exhibition season at home on Aug. 29, it's unlikely it will play Cutler and McCown, which is likely why the Bears have chosen to add Edwards and Palmer.
Chicago agreed to terms Saturday with Palmer, a sixth-round pick of the Washington Redskins in 2007, who has also spent time with the Cincinnati Bengals and Jacksonville Jaguars. In three seasons with the Bengals (2008-10), Palmer completed 10 of 15 for 49 yards and two interceptions.