You can (pin) program which callouts you wish, so it is different for each airline and even then it can be different between different aircraft.
No idea which ones Southwest uses though.
I heard quite different configurations so far, one was from "radar altitude" at 2500, 1000ft, 500ft, 400, 300, approaching minimums (either 50ft or 100ft above set minimum), 200, minimum, 100, 50 40 30 20 10 which was quite a bit too much, others just do 500ft, approaching minimums, minimums, 50, 40, 30, 20, 10, which i personally like more than the talkative version.