Typically GPWS/RA callouts can be pinned or "strapped" to the customers specs. So the 2500 RA, may or may not actually be an audible depending on what the operator has selected for their specific operation. Same goes for items like "approaching minimums" along with the various alt. callouts close to the ground. i.e., 100, 50, 40, 30, 20, 10 and so on.