VoIP Versus PSTN

 VoIP

Voice Over Internet Protocol also called as IP telephony or Internet telephony or Broadband telephony. Also refers as Phone service over Internet. This technology allows to make voice call using broadband internet connection instead of regular phone line. It is used for delivery of high range voice communications as well as multimedia sessions over Internet Protocol (IP) networks that’s why it is called as Voice over IP. Now it is one of the most effective way of delivering voice between people.

In VoIP, Internet is used as the transmission medium for telephone calls by sending voice data in the form of packets using (Internet Protocol) IP. It transmits real time voice signal from source IP address to the target IP address. In the current days Voice Over Internet Protocol (VoIP) is one of the reliable, and cost-effective alternative to early/traditional phone service.

PSTN

PSTN stands for Public Switched Telephone Network also known as traditional circuit-switched telephone network formerly it was known as only Public Telephone Network. PSTN refers to a telecommunications network which allows voice communication between people at different sites. Public Switched Telephone Network uses an old technology which uses copper wires to carry analog voice signal. It is operated by local, national and international carriers.

Public Switched Telephone Network is based on Circuit Switching concept. When a dedicated path is established between two phones a circuit is established between them. All Landlines are Public Switched Telephone Network (PSTN).

References 

https://callhippo.com/blog/knowledge/what-is-the-difference-between-voip-and-pstn#

https://www.webopedia.com/insights/voip-pots-difference-between/

https://www.geeksforgeeks.org/difference-between-voip-and-pstn/

Packet switched versus Circuit switched

 Packet-Switched networks

It move the data in separate, small blocks packets based on the destination address in each packet. When it reach the destination, packets are reassembled in the proper sequence to make up the message.

 

Circuit-Switched networks

It a type of network where the communications between end devices must be set up or establish before they can communicate. Once set up, the “circuit” is dedicated to the two nodes it connects for the duration of that connection. An example of a circuit-switched network is an analog telephone network.

 The Differences Between Packet Switching and Circuit   Switching?

Packet switching is different from circuit switching, which provides the basis for traditional telephone networks. Example of Circuit Switching:

"Some of you may remember ordering a pizza from a landline phone in your house before cellular technology dominated everyday communications. When you made a call to order that pizza, a circuit switch created a temporary and dedicated link of fixed bandwidth between communicating end nodes. This link only lasted until the call was complete. If there weren’t enough network resources available, the call wouldn’t be established or “completed as dialed.” Circuit switching can guarantee quality through dedicated bandwidth, but most of this bandwidth is wasted on “dead air.” Since the complexities of making a call are handled in the centralized facilities of a phone company, circuit switching allows the telephone itself to be a relatively simple device."

 Meanwhile for Packet Switching:

"Packet switching allows users/caller to equally share bandwidth resources. This is useful for transferring data that doesn’t require real-time responsiveness. Packet switching places the intelligence in the end nodes, rather than the phone company facilities, with a simple underlying network that only directs packets from one side to the other.  Packet switching is easier and more affordable than circuit switching. Since all the bandwidth can be used at once, packet switching is more efficient because it doesn’t have to deal with a limited number of connections that may not be using all that bandwidth. Packet switching also requires a less complicated infrastructure that can easily respond should parts of the network fail, making it quicker and less expensive to add new nodes whenever they’re needed. "

Circuit Switching allow user/caller to establish the connection from one end to another end.  But as for Packet Switching it allow multiple connection and improve the bandwidth utilization and performance.  In term of cost, Packet Switching is cheaper than Circuit Switching.

 Video on Packet Switching Versus Circuit Switching 

 References

https://www.sdxcentral.com/resources/glossary/circuit-switched-network/

https://www.computerworld.com/article/2593382/networking-packet-switched-vs-circuit-switched-networks.html#:~:text=Definitions%3A%20Packet%2Dswitched%20networks%20move,to%2Dpoint%20connections%20during%20calls.

https://www.apposite-tech.com/blog/packet-switching-vs-circuit-switching/

Introduction to Voice Over IP

What is Voice?

The sound produced in a person's larynx and uttered through the mouth, as speech or song.

What is IP?

IP address stands for internet protocol address; it is an identifying number that is associated with a specific computer or computer network. When connected to the internet, the IP address allows the computers to send and receive information.

 What is Voice Over IP?

VoIP technology enables traditional telephony services to operate over computer networks

VoIP is the technology that converts your voice into a digital signal, allowing you to make a call directly from a computer, a VoIP phone, or other data-driven devices. Simply put, it’s phone service delivered over the internet. You may also hear it referred to as IP telephony, internet telephony, broadband telephony, or broadband phone service. 

How does Voice over IP works?

VoIP technology enables traditional telephony services to operate over computer networks using packet-switched protocols. Packet-switched VoIP puts voice signals into packets, similar to an electronic envelope. VoIP packets can be transmitted over any VoIP-compatible network, such as a local area network (LAN). 

Because VoIP uses packets, much more information can be carried over the network to support and enhance your communication needs.

In addition to traditional voice services, VoIP gives you access to advanced applications that can potentially help your staff be more agile and productive. VoIP solutions aimed at businesses have evolved into unified communications services that treat all communications—phone calls, faxes, voice mail, email, web conferences, and more—as discrete units that can all be delivered via any means and to any handset, including cell phones.

Why VoIP?

Switching to VoIP might also help you save money on communications services. Long-distance and international calls are generally free with VoIP service. The only charge is for your internet access. 

Implementing VoIP doesn’t mean that all your employees have to use IP-enabled phones. The best VoIP providers implement IP telephony in a manner that protects your investment in existing telephone equipment, even if you have analog telephone stations.

References 

https://www.business.att.com/learn/tech-advice/what-is-voip-and-how-does-it-work-.html

https://www.voip-info.org/what-is-voip/?