Quote:
Originally Posted by snvv
Quality is about 20% worst than using the provider directly in ATA. Is that normal?
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That's clearly a YMMV thing, as it depends upon a lot of factors.
However, by default VoXaLot inserts itself in the call path between you and your provider. So the call path is longer (because it has to relay via VoXaLot) and this extra "latency" can sometimes (but not always) result in a little lower quality connection.
Another thing that can lower the quality of the connection, is using a different CODEC (voice transmission algorithm) between you and VoXaLot and VoXaLot and your provider. For example, if you use G711u to connect to VoXaLot, but then use G729 as the first/default CODEC for your provider in VoXaLot, then VoXaLot will be constantly converting between the two (what is known as "transcoding") during your phone call. And transcoding always seems to result in lower quality audio. So, if possible, using the same CODEC for your connection with VoXaLot and VoXaLot's connection to your provider(s) is likely to give better audio.
And make sure you are connecting to the proper VoXaLot server (the one with the lowest latency to you and your providers). For example, if you are in the USA, be sure your VoIP adapter is using "us.voxalot.com" vs one of the other VoXaLot proxies (or "au.voxalot.com" if you are in Australia, etc). Because while any of the servers will work, using the server closest (on the internet), to you and your providers, will generally result in the fewest (internet related) distortions of the sound.
Finally, in some cases it is possible for VoXaLot to get out of the way and leave the final connection directly between you and your provider (after VoXaLot does all the setup). This option is NOT on "by default", as it has the risk of blocking the audio if everything isn't setup just right. However, this option can (when it works) improve audio quality (by lowering latency and possibly jitter). So if you want to experiment with this option, follow the instructions here:
HowTo: 6 Steps To Optimize Your Audio - Voxalot FAQ