Long before the invention of the Internet and Email, Voice was the prevailing method of Business-to-Business communication. By 2016, however, it was estimated that email was used 98% of the time.
But when it comes to Business to Consumer or vice versa, Voice Communications is still the most prevailing method of interaction.
On-Site Business Voice communications can be classified in two categories: Traditional TDM and VoIP. (Mobile Communications uses a combination of multiplexing techniques to transfer voice communications. (See Mobile Services)
TDM (Time Division Multiplexing) was the only technology used to transmit phone calls. TDM is based on electrical circuits that are physically switched on the public switched telephone network (PSTN) owned by phone carriers.
Then came the Internet and later on in 1989 Alon Cohen (Israeli entrepreneur) co-founded VocalTec Inc., and is the co-inventor of the first audio transceiver that made VoIP possible. He is considered the Inventor of Voice over Internet Protocol (VoIP) which is the technology for the delivery of voice communications and multimedia sessions over Internet Protocol. VoIP technology enabled the use of the Internet, instead of traditional landlines, to make phone calls by converting voice calls into packets of data that travel over the public Internet or private Internet Protocol Networks.