i pissed in one yesterday close to my stand so we'll see what happens, may have ran him off for good...?
as for calling, i don't know. i've only had luck with it a few times. saturday evening a fork horn come in under me sniffin' around so i grunted at him a few times and he really didn't pay much attention to it, just lifted his head to look around and right back to eating acorns.