Ключевые слова: architecture, assistance, background, call, center, communication, computer, constructon, contact, customer, desk, device, equipment, global, hand, handset, headphones, headset, help, helpline, horizontal, internet, keyboard, laptop, man, marketing, microphone, mobility, office, operator, over, people, phone, protocol, receiver, representative, sales, service, support, technology, telecommunications, telemarketing, telephone, voice, voip, wireless,