Experts say that people will judge you in first 4 seconds and after 30 seconds, there will be a filter about you and judge you as per the filter. You should understand that the filter is made by your behavior. Same happens in your business too. Even people will judge you by your telephonic conversation and decide if they have to do business with you or not.
Micro expressions like smile, eye contact, hand gestures, fidgeting and posture speak a lot about general attitude and emotions. You will be able to create trust about your business by following proper gestures.