stickman393
Or bandpass actually

Telephones passed 300Hz-3.4KHz so bandpassing that is a good start. It should take care of most sibilance as well, but you can always adjust to taste. You may also want to run the same filter back-to-back, to make sure you drive the filtered frequencies down, depending on which EQ you use and how effective it is. I would get that range to your liking before passing it on into any additional processing.