When you speak into your phone, your analogue voice is digitized and then compressed so it takes up less bandwidth, at the receiving end of a call your voice must be decompressed before it can be transformed back into the analolg domain.
Even rarer codecs such as those used in GSM cellular networks may also be options. Below is a table of all the major codecs used, the corresponding compressed bit rate and how much bandwidth over the internet is required.
The quality of the call is not only dependent upon the codec used but also on the quality of the internet connection. This number is a very good approximation of the bandwidth required for one phone call. The table below shows the top business VoIP providers on whichvoip. Some providers do not give you the option to change the codec and you are stuck with the one they support, typically this is the G codec as it is the simplest to implement and still gives excellent call quality.
As can be seen from the table above some providers will allow the phone administrator, via their user portal to set the codec for each extension. Most business VoIP providers will, by default set the codec to the one that conserves as much bandwidth as possible.
This however will result in the poorest voice quality, which may still be good enough. As with most things in life, there is a compromise. The compromise here is between quality and bandwidth, unless you are lucky enough to have unlimited bandwidth.
When looking for a business VoIP service, most decisions are based around price, features and reviews. However, knowing the codecs used and how much control as a user you have over them is certainly something you will want to take into consideration. Published by WhichVoIP. This comparison only talks about bandwidth requirements. What about reliablity? Ever single codec on here aside from ILBC will do horribly with any packet loss. Opus has this built in, but only when both sides are compiled properly and pass the correct SDP headers.
As for reliability, it does mention QoS in the networking section and the importance of a good Internet connection. ITU introduced this codec in for digital telephony use.
Both being the default standard in each respective country. This utilizes a logarithmic compression and squeezes bit samples to 8-bits. So, the compression ratio it achieves is It offers improved speech quality when compared to G. This codec has low requirements on the bandwidth front and also offers good audio quality. It encodes the audio in frames, with each frame being 10 milliseconds. Each frame contains eighty audio samples. When used for the purposes of VoIP frames can be sent in a packet.
This is a licensed product, so the simplest way to leverage it is buying hardware that uses it, thus the fee will already be paid. A common variant of it is G. On the MOS scale it just hits the 4. The patent for the G. There are 2 variants of this and both operate on 30 millisecond audio frames, but they operate of different algorithms.
Broadly, there are three common VoIP codecs. The G. However, it also requires the most bandwidth. This codec requires at least 96Kbps of bandwidth per line.
If you want slightly better audio quality, you can use this codec with less compression. But that will require Kbps or Kbps of bandwidth per line. But this codec is a good choice if you need high definition audio quality. At the highest compression rate, this codec requires only 32Kbps per line. If you have more bandwidth and want better audio quality, you can use up to Kbps per line. This codec works well if you want the option of increasing compression to temporarily add more VoIP lines using the same amount of bandwidth.
At the highest compression rate, this codec requires just But, typically, this codec requires 16Kbps or The impressive thing about the G.
This codec is a very good choice if you need to connect high volumes of VoIP lines. The audio quality is high enough for business calls.
And the bandwidth requirements are low enough to make efficient use of your internet connection. And, based on the rough estimate of Kbps of bandwidth per line, you could support a few VoIP lines with 0.
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