Final Cut Pro : Telephone sound effects are missing in Final Cut pro

The Channel EQ has one that's built in but it's honestly not that great.

I usually just throw on a Channel EQ, raise up ≈3K and lower all the other frequencies.

Something kinda like this, but play around with it, this is just a general starting point.

Phone Filter Notch and Phone Filter Wide Band are probably more like what they're looking for. I think, not sure, that Telephone EQ is intended for things recorded from a telephone.

Phone Filter Wide Band looks more like a normal telephone "sound" curve:

Ignore my previous comment.

A Telephone EQ is to be found in the Channel EQ audio effect.

These settings in the red rectangle give a reasonable simulation from which you can experiment to get the precise sound.

I think you are correct.

I had to correct the Telephone filter as in my second screenshot to get a suitable sound.

I had not noticed the Phone Wide Band.