Ключевые слова: 4050 years, adult, answering, attending, business, business person, businessman, busy, caucasian ethnicity, cheerful, communication, connection, customer, dial, discussion, employee, facial expression, happiness, listening, male, mature adult, middle aged, mobile phone, negotiation, networking, one man only, positive emotion, serious, smart phone, smiling, talking, telephone, trader, using phone, voice, white, working,