Understanding Session Border Controllers: Comprehensive Guide to Designing, Deploying, Troubleshooting, and Maintaining Cisco Unified Border Element (CUBE) Solutions

Chapter 1

Laying the Groundwork

The field of communications has come a very long way since the introduction of the telephone in the 1800s by Alexander Graham Bell. Voice over IP (VoIP) traces its roots back to as early as the 1920s, when the first advancement in reproducing speech electronically and transmitting it over long distances was made. Decades later, in 1974, a significant milestone was achieved when the first voice datagram was transmitted over ARPANET, the precursor to the Internet. The year 1974 also saw another significant milestone in the history of the Internet: the introduction of Transmission Control Protocol (TCP), which would revolutionize the way information was transmitted over the Internet.

Experiments carried out in subsequent ...