Please consider the question solved.
For others who meet the similar problem: that was iBooks bug.
Actually I met 2 iBooks bugs:
1) Custom font char with low char code (like ! replaced with a custom char) is not shown.
2) Monospace font is not applied to <span> inside <code> even if forced with CSS rules.
These look purely like iBooks bugs, I used Sigil & analyzed the structure with unzip to make sure that the book is ok.
P.S. I found a small issue in ebook-converter too.
It doesn't cut the query part from url links like url('my.tff?123'), so the font could not be found in some of my cases. But if that's an url, the resolving algorithm could take it into account.
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