What is VoIP
What is VoIP
One with the newest ways to transmit telephone calls is to use the Internet. A technology referred to as Voice over Internet Protocol (VoIP) makes this possible. It is a group of transmission protocols that delivers voice communications over IP networks, with common being the Internet.
VoIP is a form of digital telecommunication that takes place over the Internet. Early kinds of communication were according to analog systems where frequencies were sent over distances and retransmitted over and over until they reached their destination. These were analog systems since they were "smooth" from source to destination. An example of an analog signal is always to take an elevator to increase to the subsequent floor; it is often a smooth transition. A digital signal, otherwise referred to as discrete, will be likened to using the steps in a staircase to go to the next floor.
The newer systems are digital. Digital transmissions require a signal and break it down into millions of packets for delivery. Each packet looks a similar on the outside, nevertheless the data content in each one of these makes them different. The reason that digital transmissions are preferred over analog is always that outside interference is minimized and also the signal is steady and direct without fading or dropping.
In VoIP, you will take an analog signal and convert it into a digital signal in the sending side, then turn the digital signal to a analog signal in the receiving side.
Because the signals are transported over the Internet, VoIP systems employ different session control protocols that may govern the set-up and tear-down of calls. There are also audio codecs, which encode speech, allowing the transmission over an IP network as digital audio via an audio stream. A codec is a set of technology specifications for audio or video which can be applied to a hardware device to allow it to activate with other devices.
Some VoIP implementations count on a feature called transmission narrowband. This is a way of manipulating the signal by coherence making it more uniform and compressed speech so that packets will not go over certain restrictions or limitations. This will affect voice quality. But other codecs support high fidelity stereo, so the voice quality will change.
The first technology challenge which had to be addressed was how to cope with the transmission of voice. The VoIP protocol specifies what sort of transmission and reception of audio occurs over the Internet. The critical link between the call sender along with the call recipient is established using the Session Initiation Protocol (SIP). This protocol has many functions, but the most important include negotiating the codecs utilized to make the decision, the way to transfer calls, and the way to terminate an appointment.
During a trip, VoIP phones communicate directly over an IP and stream audio directly. But the problem is the fact that analog phones and phones cannot use SIP or peer-to-peer calling. So VoIP deployments use the Internet Protocol / Private Branch Exchange (IP PBX) service, which serves as a bridge from a phone utilizing an IP-based calling function, and also the Public Switched Telephone Network (PSTN) this is the regular public phone system.
Here analog cellular phones and regular phones can hook up with the PSTN but VoIP phones cannot. So to make the phone call possible, routing the audio from your VoIP phone occurs using an IP PBX then to the PSTN. This allows a VoIP phone to make a phone call to either an analog or cellular phone.
Image Credit: Dynaplex
Back in 1995 a little technology company, Vocaltec, released the initial internet phone software. It was designed to run on a house PC, also it utilized sound cards, microphones and speakers similar to the PC phones used today. "Internet Phone" was the name of the product, also it operated while using the older H.323 protocol as an alternative to SIP (Session Inititation Protocol), that is more commonly used today.
The Company had some initial success with Internet Phone, plus it even launched a prosperous IPO in 1996. But the insufficient broadband availability in 1995 was obviously a major drawback. Many people were using dial-up, not cable or DSL. Because of this, the program used modems, and also this resulted in poor voice quality compared to a regular call. However, it represented a milestone as the first IP Phone.
Even though by 1998, VoIP traffic had grown to represent only 1% of voice traffic in the United States, network engineers and companies saw plenty of potential. Networking manufacturers like Cisco and Lucent started to produce networking equipment that can route and switch the VoIP traffic. By 2000, VoIP traffic had grown to greater than 3% of all voice traffic.
By 2005, major voice quality issues had been addressed and resolved, and VoIP traffic could be prioritized over data traffic. This result in reliable, clear sounding, and unbroken calls. Revenue from VoIP equipment sales alone reached nearly $3 billion well as over $8.5 billion by the end of 2008.
Communication technology continued to change throughout the '90s. The newest technology was VoIP (Voice over IP). The IP was the Internet Protocol utilized by computers to deliver information over the Internet. Now phones could do this as well. Because it would be a low cost technology, also it used the current Internet framework, individuals and businesses could lower your expenses by switching for this technology. It avoided some from the problems inherent in analog telephone service, like dropped calls or crosstalk. VoIP is resilient also it can provide with mobile or analog phones.
For read more about VoIP see Popular VoIP Phones
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