What is VoIP
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What is VoIP
One of the newest ways to transmit telephone calls is to use the Internet. A technology known as Voice over Internet Protocol (VoIP) makes this possible. It is a family of transmission protocols that delivers voice communications over IP networks, most abundant in common being the Internet.
VoIP is a form of digital telecommunication that can take place over the Internet. Early forms of communication were depending on 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 usually to take an elevator to increase to another floor; it is really a smooth transition. A digital signal, otherwise generally known as discrete, would be likened to utilizing the steps in a staircase to go to the next floor.
The newer systems are digital. Digital transmissions have a signal and break it down into millions of packets for delivery. Each packet looks exactly the same on the outside, however the data content in each makes them different. The reason that digital transmissions are preferred over analog is the fact that outside interference is minimized as well as the signal is steady and direct without fading or dropping.
In VoIP, you are likely to take an analog signal and convert it into a digital signal on the sending side, then turn the digital signal with an analog signal at 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 with an audio stream. A codec is really a set of technology specifications for audio or video which might be applied to a hardware device to allow for it to have interaction with other devices.
Some VoIP implementations depend on a feature called transmission narrowband. This is a way of manipulating the signal by coherence making it more uniform and compressed speech in order 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 approach the transmission of voice. The VoIP protocol specifies the way the transmission and reception of audio occurs over the Internet. The critical outcomes of the call sender along with the call recipient is established using the Session Initiation Protocol (SIP). This protocol has numerous functions, though the most important include negotiating the codecs employed to make the phone call, how you can transfer calls, and how you can terminate a phone call.
During an appointment, VoIP phones communicate directly over an IP and stream audio directly. But the problem is 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 the phone utilizing an IP-based calling function, and also the Public Switched Telephone Network (PSTN) this is the regular public phone system.
Here analog cell 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 the VoIP phone occurs using an IP PBX and then to the PSTN. This allows a VoIP phone to make a trip to either an analog or cellphone.
Image Credit: Dynaplex
Back in 1995 a small technology company, Vocaltec, released the very first internet phone software. It was built to run on a home PC, also it utilized sound cards, microphones and speakers much like the PC phones used today. "Internet Phone" was the name with the product, and yes it operated while using older H.323 protocol as an alternative to SIP (Session Inititation Protocol), which is more commonly used today.
The Company had some initial success with Internet Phone, and yes it even launched an effective IPO in 1996. But the deficiency of broadband availability in 1995 would be a major drawback. Many people were using dial-up, not cable or DSL. Because of this, the software used modems, which resulted in poor voice quality over a regular telephone call. However, it represented a milestone as the very first IP Phone.
Even though by 1998, VoIP traffic had grown to represent only 1% of most voice traffic in the United States, network engineers and corporations saw a lot of potential. Networking manufacturers like Cisco and Lucent began to produce networking equipment that may route and switch the VoIP traffic. By 2000, VoIP traffic had grown to greater than 3% of most voice traffic.
By 2005, major voice quality issues have been addressed and resolved, and VoIP traffic might be prioritized over data traffic. This bring about reliable, clear sounding, and unbroken telephone calls. Revenue from VoIP equipment sales alone reached nearly $3 billion and also over $8.5 billion in the end of 2008.
Communication technology continued to alter throughout the '90s. The newest technology was VoIP (Voice over IP). The IP was the Internet Protocol utilised by computers for you information over the Internet. Now phones could do this as well. Because it was obviously a low cost technology, plus it used the present Internet framework, individuals and businesses could spend less by switching to the technology. It avoided some in the problems inherent in analog telephone service, like dropped calls or crosstalk. VoIP is resilient plus it can be utilized with mobile or analog phones.
For read more about VoIP see Popular VoIP Phones
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