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What affects the VOIP phone quality?


omakalou12
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I tried many VOIP phone services, and found that some will provide you with good quality phone service, especially like sound is clear, call is smooth and not stuck sometimes. So except the internet connections, which part of the hardware and software affect the VOIP phone quality?

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There is a specification in the hardware that must support Wideband, HD, or TIA-920-B. All three terms mean the same thing which I believe means FM radio quality. Via software the phone must support the G.722 codec and so must your VoIP provider, but the call for the entire route must use G.722 or quality is compromised.

 

If your familiar with Snom, their older 3xx series can be upgraded very easily with this, the new phones are already enabled for Wideband:

http://www.snom.com/en/products/accessorie...rvoice-handset/

 

For Polycom look for "HD" support in the phones description.

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I tried many VOIP phone services, and found that some will provide you with good quality phone service, especially like sound is clear, call is smooth and not stuck sometimes. So except the internet connections, which part of the hardware and software affect the VOIP phone quality?

 

In version 4, we are promoting the use of RTCP-XR. The "XR" stands for extended reports, where both the phone and the PBX are reporting to each other on how the call quality is. The bottom line is the "MOS", which is a value between 1 and 5. The calculation of the MOS is a complex topic, espcially when it includes bursts. We include the report in the CDR, so that administrators and providers can actually track it. There you can find more than just the MOS, for example also information about bursts, packet loss, jitter and so on.

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