[LARTC] Info about VoiP Qos

[Riccardo Losselli <riccardo@e4a.it>]

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Hi, i've been working on VoIP qos in the few weeks.
I shape IAX2 and SIP, and i'm getting some interesting results.
Im using HTB, the line is 512Kbps dedicated line, and we have some
servers on the same line that generate quite a lot of traffic,
frequently saturating the link.
I've read through LARTC how to, example, etc, and so far i'm at this point:

I can can shape the servers traffic, based on ip and services
I can shape the Voip traffic
If i reserve some bandwith for VoIP and the rest for server traffic, it
all runs smooth
This setup works by creating a root disc, then two "source" disc, one
rated at 100 Kbps for voip, one rated 300Kbps. The remaining 100Kbps is
"wasted" to avoid buffering from the router

But i would like to have the possibility to use all the 400Kbps and slow
down server traffic only when and if needed.

I prioritized VoIP traffic, using the various scripts around, and what i
get is that, even if voip quality is definitely much much better than
without shaping, there are is still statics and pops, and some
interruption of the voice and only if i'm called from POTS
I do not get this when completely reserving the bandwith or when the
link is not loaded.

i would like to ask if this is a normal behaviour before keeping to try
to understand if i missed something somewhere..
if it's not normal i would post my script and ask for a suggestion.
BTW i get the same results when using wondershaper and so on.

Thanks,
Ricky
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