NEW YORK -- Baseball umpires and management signed an agreement yesterday that will allow the sport to start using instant replay to help determine calls on the field.

Major League Baseball still hasn't determined when the use of replays will start. Installation of equipment has been going on at ballparks, and officials have said they hoped to start using replay in August.

Replays will be limited to boundary calls, such as determining whether fly balls were fair or foul, or whether they went over fences.

The deal was signed by management lawyer Dan Halem and WUA attorney Dan Lam one day after a WUA spokesman went public with complaints over negotiations.