A CLEC did it again.

XTS , SW 2.23, PRI card (not combo) Ver 1.0h.

They switched over to a soft switch from an PRI that was riding on an ATT line fed by a #5ESS. Two calls come in at the same time and the second call will not route correctly. I told them to put it back on their #5ESS office switch. They did so but over their fiber link versus the old ATT copper trunk. Of course it's doing the same thing.

Any ideas?