Ключевые слова: assistance, background, black, business, button, call, center, closeup, communication, concept, connection, corporate, dial, help, helpline, horizontal, inscription, internet, keypad, landline, landline phone, making, minus, modern, mute, network, number, object, office, phone, photo, plus, receiver, reception, row, seller, service, silence, support, system, talk, technology, telemarketing, telephone, text, vol, volume, word,