They call has little to do with coyote calling as they will come to most sounds if you are in the right place. A dying rabbit on a mouth call seems to work all the time, hurt pup has it's followers as does howling. Remote callers also work, over the years I've used a bunch from a battery powered phonograph in the 60's through cassettes, CD, sound chips and digital, they all called critters.
Spend sometime reading calling books, or watching calling DVD's Tony Tebbe has a very good one on learning how to hunt not just kill vid's.