kaellexi,
You really get misgendered on the phone with that voice?! That totally blows me away! I never get misgendered on the phone or voice chat, ever, and I don't think my voice is particularly any more feminine than yours.
What does happen to me some times is I let my voice relax more than I should and end up speaking from the wrong place for half a word or so, if I haven't been speaking for a while or I just got up in the morning. This only really happens to me around my mother, though, for the most part. Maybe something like that happens to you and you don't realize it?
I honestly don't know what else it could be for you. If you haven't changed your legal name and people have paperwork in front of them on the other end of the phone, maybe that's it? I genuinely, strongly believe your second voice in that clip sounds totally female. There should be no reason people are misgendering you.