Sunday, February 24, 2008
VOIP Codecs
The world of telephone and data are converging faster than ever. In order to transmit voice over IP a need for codecs arise. When your voice enters into a VOIP system it is converted from an analog signal to a digital signal and then transmitted across a network only to be converted back to an analog signal. This is where the codec becomes important. Both end devices have to agree to use the same codec in order to communicate. There are many different codecs to choose from, but in the VOIP world we really only use two (G.711 or G.729). G.711 is the best one to use for voice quality however it uses the most bandwidth. G.729 is the best all around codec to use due to the low bandwidth use high voice quality. If you don’t feel you need this yet just wait until you try to put voice on your network? Just one call using G.711 will run over 90K and before you know it all of your bandwidth will be used up. For more information go to the following site: http://www.ozvoip.com/voip-codecs/
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2 comments:
Obviously companies like Vonage and the cable companies are using methods of VoIP, but what about the phone companies? Are they still using straight analog, or are have they also been using VoIP for some time now, but not nearly as good as selling it as such? I would assume that with the advances in telephony, and the mass expansion of US markets, they would have already been forced to look to tech like this, for stability and scalability.
Sounds pretty good, I didn't know that about VOIP codecs.
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