| Voice over Internet Protocol or VoIP is a revolutionary | | | | second. It depends on the codec which is being used |
| technology which takes analog audio signals and turns | | | | that's what are the sampling rates like 64,000 times |
| them into digital data which can be transmitted over | | | | per second, 32,000 times per second or 8000 times |
| the internet. It has the potential to wholly revolutionize | | | | per second. Out of this most commonly used codec is |
| the world's phone system. Its providers are already | | | | G.729A codec which has sampling rate of 8000 times |
| very successful and major carriers, such as Vonage, | | | | per second. |
| AT&T are in the process of setting up VoIP plans | | | | A Codec uses advanced algorithm for the purpose of |
| across United States. Above all, VoIP is basically very | | | | sorting, sampling, and compressing and finally packetize |
| clever invention which has the future capability to | | | | the data. The most prevalent algorithm is CS-ACELP |
| replace the so called traditional phones or even cell | | | | algorithm in VoIP. It stands for conjugate-structure |
| phones because of quality and cost. | | | | algebraic-code-excited linear prediction. It functions by |
| Now we talk about VoIP codecs: Codec which | | | | organizing and streamlining the bandwidth availability. |
| basically stands for Corder-Decorder functions by | | | | Another aspect of this is Annex-B which functions by |
| converting audio signals into compressed digital signals | | | | creating the rule of transmission as it states that if no |
| for the purpose of transmission and again into | | | | one is talking then don't send the data. This rule |
| uncompressed signals to replay. This is the essence of | | | | created so much efficiency in its greatest ways that |
| Voice over Internet Protocol. Codecs sample the audio | | | | packet switching became superior to circuit switching. |
| signals thousands times per seconds and thereby | | | | The codec works by using the algorithm for converting |
| accomplish the very purpose of conversion. Example- | | | | and sorting everything out. But it fails when you don't |
| G.711codec which samples the audio at a speed of | | | | know where to send the data. This problem is handled |
| 64000 times a second. Each tiny sample is converted | | | | through the use of soft switches. These switches use |
| into digital data and then compressed for transmission. | | | | a numbering system so as to route the phone call |
| Now after reassembling 64000 samples, pieces of | | | | towards the area codes. Based on this numbering |
| missing audio become very small to the human ear, | | | | system anyone can be located conveniently, no |
| that when you listen seems like one continuous | | | | matter in which corner of the world. |