Lisa provides a brief history of the telephone and the PSTN (public switched telephone network), starting with the invention of the phone to the Bell Telephone Co. and then later AT&T, all of which delivered phone services to much of the country for many years.
(Instructor) A strong telecommunications infrastructure…is essential for the health and expansion of the economy.…Currently, most voice traffic travels…over the internet using voiceover IP or IP telephony.…However, it's important to understand…the telephone framework because this is the basis…for the current networking infrastructure.…Today's internet had humble beginnings,…with the invention of the telephone in the late 1800s.…
The Bell Telephone company and then later AT&T…delivered local and long distance phone services…for much of the U.S. and Canada for many years,…all on the backbone of a public switch telephone network,…which is a collection of commercial…and government-owned networks that carry voice traffic.…Alexander Graham Bell, who lived in Canada,…and worked at a school for deaf children in Boston,…invented the telephone between 1874 and 1876.…
Bell patented the telephone in 1876,…and then demonstrated the device…at the 1876 World fare in Philadelphia.…The first telephone line using existing telegraph lines…
Lisa Bock compares the traditional Public Switched Telephone Network (PSTN) to VoIP, and discusses the framework and components necessary for VoIP to be possible. She reviews codecs, including characteristics such as bitrate and voice quality; protocols for setup, communication control, and data transport; and media gateways, signaling protocols, and intermediary systems such as translators and mixers. Lisa then reviews business integration and the importance of conducting a needs analysis and network assessment prior to implementation. Learn about the many value-added services UC can provide, such as integrating VoIP with email, billing, management software, and other customer management systems. Lisa wraps up with a discussion on how ensuring quality of service (QoS) in a VoIP network minimizes latency and jitter and the importance of VoIP security to prevent malware, impersonation, hijacking, and denial of service attacks.
- History and evolution of PSTN
- UC overview and components
- Gateways, including signaling gateways, translators, and mixers
- Integrating VoIP and UC into your business network