Ключевые слова: 3039 years, 6069 years, answering, attending, business, businessman, busy, casual, cheerful, communication, connection, customer, dial, discussion, entrepreneur, executive director, happiness, indoors, listening, male, man, mature adult, middle aged, middleaged man, mobile phone, modern, negotiation, networking, office, old, one man only, one person, positive emotion, senior, serious, smart phone, smiling, talking, telephone, using phone, voice, white collar worker, white people,