How is “get through to” used?

In Good Will Hunting (1997), one line is: “And I need someone who can get through to him.”

Which movie is “get through to” from?

The clip at the top of this page is from Good Will Hunting (1997).

to make sb understand or accept what you say, especially when you are trying to help them; to make contact with sb by telephone; to reach sb

Oxford50% of films
to make sb understand or accept what you say, especially when you are trying to help them
And I need someone who can get through to him.
Oxford30% of films
to make contact with sb by telephone
Oxford20% of films
to reach sb

Definitions from the Oxford Advanced Learner's Dictionary, 9th edition

And I need someone who can get through to him.

Said in 8 films · #1