THE TELEPHONE REVOLUTIONIZED COMMUNICATION. Its impact foreshadowed the coming computer revolution. As telephones became more and more common, appearing in nearly every home and workplace, they became the way to communicate. Indeed, until the mid 1980s, personal and business communications involved three primary tools:
Telephone—Used for real-time voice communications between people
Answering machines and voice mail—Critical for store-and-forward voice messaging and retrieval
Fax—Real-time data transmission of documents through analog phone lines
In the 1980s, telephones began to evolve from their analog origins into digital devices. Telephone and voice-mail systems became digital. Then the ...