What the fellas said. I never used an "ecaller", they where not even made when I was real into calling, I made my own with a walkman radio w/ cassette player, amplifier and loudspeaker
Redneck style, but it worked and still have it. Full discloser, most of my kills where by leg hold traps, as that was my "bread and butter" STS, calling was only maybe 40% of it for me. Would try that first for a target animal, then the traps came out.
If I was targeting a cat, I almost always used a baby woodpecker, or other bird AND always stayed on stand at least 30 minutes. You will have to pass on fox as they seem to always come in fast to any call, but I have taken yotes and continued calling and still had a cat come in, so...Baby cottontail, as mentioned has also brought them in, but when yote calling, I was usually done in less than 15 minutes either to move ,or drt yote.