ok start with basics. when you get allocated the extension with issue via nice query to dial and you dial it it answers right?
if it does then the rap unit is ok, if it doesnt rap maybe at fault.
the extension that you say has the issue in output bus definition what output channel is it 1,2,3, or 4?
if you save the call as a wav file and then replay the call via the problematic extension does it play now. what sp do you have on logger?
on output manager module on cls the colour should change as output is allocated does this happen
in nice admin under channel groups output channels do they all show?
whats sp is your apps on, have you tried restarting output manager. did you run bugfind on logger to see if there are fatals with regard to laf card?