Practice will help you become aware of your diction and vocal quality. Introduce yourself politely to the receptionist. Read company materials or a newspaper or trade journal while you wait. When you are called , stand up completely before walking across the room. Firmly shake the interviewer's hand and smile confidently.
Most recruiters unconciously respond to their first impressions.
The first two minutes can be crucial. Show interest by standing properly, not crossing your arms over your chest and maintaining appropriate eye contact. Give nonverbal feedback by nodding or smiling at appropriate times. The interview starts , in most cases, with a little small talk and further introductions, if necessary. Then the recruiter will state the purpose of the interview.