How is cloud telephony is different from internet telephony, VOIP, and services like Skype?


1. Voice Over Internet Protocol (VOIP):

VoIP stands for Voice Over Internet Protocol, also called IP telephony, Internet telephony, or Broadband telephony. In simple it refers to the Phone service over the Internet. This technology allows making voice calls using a broadband internet connection instead of a regular phone line.

2, Public Switched Telephone Network (PSTN)​:

PSTN stands for Public Switched Telephone Network, also known as the traditional circuit-switched telephone network. Formerly, it was known as only Public Telephone Network. PSTN refers to a telecommunications network that allows voice communication between people at different sites

1Voice over Internet Protocol uses packet switching.Public Switched Telephone Network uses circuit switching.
2In VoIP, only an internet connection is required.In PSTN, dedicated lines are provided by the telecom company.
3No dedicated path is required between sender and receiver.A dedicated path is required between sender and receiver.
4One VoIP lines require 100 kbps.One link typically supports 64 kbps.
5Scalability and upgrades require improved internet bandwidth.Scalability and upgrades require substantial hardware additions.


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