Good question, I know the FoxPros have the FoxBang feature, my Foxpro Inferno Foxbang feature starts the female howl sound. I thought it was supposed to start the pup distress sound.
Coyote around me are always close, moving and on high alert. I bark at them with my mouth... that seems to work half the time, when im lucky.
But I sure know if a coyote is in front of me running around, I dont have the remote in my hands, theres no way I could fumble with the rifle and foxpro remote with a coyote under 100 yards in the open.
I few sounds I would try to stop them if I was relying on an Ecaller would be pup distress, female challenge, female howl. Or just yell a bark at them.