Check again, it'll say HSBY above the HKG on each day there is a standby period. Trust me, I'm not making stuff up. I am talking FO lines, maybe you looked at Capt?

SFS stby would be a dream, they give those guys cell phones as well so that they may roam as they please. I always just carried mine in HKG and told scheduling to call me. They were always cool with that.