It depends on whether you are talking about warning barking or howling. If they are howling, just call like you normally would and consider yourself fortunate to know what direction they will probably approach you from. If they are warning barking, which is usually a lot of barking instead of howling, then they usually sense that something is not right. You can leave one guy to entertain them and have the other guy sneak them as Rich has suggested.
As a general rule of thumb, if a coyote is close they will usually come in without answering. If they are mid range they will generally howl awhile then come in. If they are quite a distance, they will usually howl for quite a while and not come in. You have to move on them. Right Albert? LOL!
I hope that helps! Wiley E
[This message has been edited by Wiley E (edited 03-07-2001).]