June 2005
Intermediate to advanced
502 pages
21h 48m
English
Content preview from Switching to VoIP
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QoS Past and Present
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perceived by your system users will be lower than it ought to be. It also illustrates
that you must arm your IP network against congestion.
How you can use the MOS scale
MOS can aid you in rating the perceived quality of your legacy system. Not all sys-
tem builders will have the time or inclination to do this. But, if you support more
than a few-dozen users or if call quality can vary depending on the call path, you
should determine the MOS rating of all call paths on your current system. Ask a
group of users to place calls across each call path and then record their MOS opin-
ions of each call.
Do this before you replace your legacy links with VoIP. This way, you can use the
scores as a guide when selecting standards and equipment for your new VoIP sys-
tem. You can also tell whether you’ve succeeded in replicating the call quality you
had before you started to replace legacy equipment.
After the implementation, particularly in large corporate or carrier-class networks,
establish an SLA (service-level agreement) between you and your users that provides
an MOS expectation for every call path that meets or exceeds that of your legacy
system.
Noise
In traditional telephone networks, like the PSTN, the MOS scale was used to give
engineers feedback that could be used ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.