[VoiceOps] Call Quality

[Tim Bray]

Hi,


It depends on your definition of pipes not too overloaded.   And I'm 
presuming from mention of pipes that you mean network induced call 
quality problems.


Usually bufferbloat.   Routers with too much memory cause a lot of 
latency at the point of a fast to slow transition in the network.



And this can be caused by anything from a crappy DSL router on upstream, 
and somebody emails a large attachment during a call. Or it can be 
something like a unsupported 100meg optic on the customer side of a 
juniper edge router on a 10gig core. Customer does a download, latency 
goes nuts and all the phone calls sound naff.


Tools to test.

fast.com and press the `Show more info` button.   Forget the bandwidth 
figures, and look at the difference between the loaded and unloaded 
latency.  If a big difference, you have a problem.



http://www.dslreports.com/speedtest  This will give a bufferbloat 
score.  Then look at the results, and scroll down a bit and it will show 
you upload and download latency figures for idle, downloading and 
uploading.    (This is one of the most amazing tools, and I'd love a way 
to pay them some money each month to support the service.  They were 
struggling a bit at some stage.)




Tim



On 13/06/2021 19:11, Mike Hammett wrote:
> I've heard a variety of complaints and concerns over the years about 
> call quality. How are these quality issues introduced? As long as 
> pipes and equipment aren't overloaded, where is a quality issue to 
> come from?
>
>
> Obviously, the closer you are to the handsets, the less opportunity 
> there is for issues. What else is there to take into account?
>
>
>
> -----
> Mike Hammett
> Intelligent Computing Solutions
> http://www.ics-il.com
>
>
>
> Midwest Internet Exchange
> http://www.midwest-ix.com
>
>
>
>
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