Sometimes the only option is to yell if they can't hear you. But most of the time it's best to use other ways of communicating unless we like being yelled at, which most of time is not the case.
It's funny how pictures speak a thousand words right? Picture your whole body as a means of communication and the words you say will have so much more depth and meaning.
We've all got qualities and defaults. Pluses and minuses. Getting know how other people function in their day to day lives will also help you understand yourself. Which in turn will help you know others even more...and the cycle continues!
Building rapport by wanting to know about someone else makes the other person feel special and important. Be a detective in your questioning in a genuine curious way.