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VoiP Codecs

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There are many codecs for audio, video, fax and text. Below is a list of the most common codecs for VoIP. As a user, you may think that you have little to do with what these are, but it is always good to know a minimum about these, since you might have to make decisions one day relating codecs concerning VoIP in your business; or at least might one day understand some words in the Greek VoIP people speak! I won’t drag you into all the technicalities of codecs, but will just mention them.

If you are a techie and want to know more about each one of these codecs in detail, have a look there.

Common VoIP Codecs

Codec Bandwidth/kbps Comments
G.711 64 Delivers precise speech transmission. Very low processor requirements. Needs at least 128 kbps for two-way.
G.722 48/56/64 Adapts to varying compressions and bandwidth is conserved with network congestion.
G.723.1 5.3/6.3 High compression with high quality audio. Can use with dial-up. Lot of processor power.
G.726 16/24/32/40 An improved version of G.721 and G.723 (different from G.723.1)
G.729 8Excellent bandwidth utilization. Error tolerant. License required.
GSM 13 High compression ratio. Free and available in many hardware and software platforms. Same encoding is used in GSM cellphones (improved versions are often used nowadays).
iLBC15Robust to packet loss. Free
Speex 2.15 / 44Minimizes bandwidth usage by using variable bit rate.
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