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[tipauni-help] How to set font just for tipauni?

Dear sir/madam:

Thanks for the tipauni package. It makes me typing tipa symbols in my unicode document. 
However I have a template which I have to type tipa on it. I can't change the template font "TeX Gyre Termes".
But this font doesn't contain the glyph that tipauni needs, like:

\setmainfont{TeX Gyre Termes}
% \setmainfont{CMU Serif}
  \fbox{\textrtaild}, \fbox{\textipa{4}}

it will produce 

so how can I display tipa glyphs without changing the main font? Thanks.