Traffic shaping in a VoIP environment

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Howdy,

I'm working on the AstLinux project (www.astlinux.org) and we've been taking various open source bits and pieces to build a telephony appliance-in-a-box (with firewall, support to PRIs, run-from-flash on lower power hardware, etc).

It's been working pretty well, but there were a few issues having to do with QoS that I've not been able to work out alone entirely.

We're trying to do a plug-in for Arno's iptables firewall:

http://rocky.molphys.leidenuniv.nl/

And what I've come up with based on previous work by Maciej Blizinski was:

http://rocky.eld.leidenuniv.nl/iptables-firewall/plugins/hfsc-traffic-shaper/

Ok, for handling unmarked traffic, this seems to work pretty well.

But what if I want to take previously marked traffic, and (assuming I can trust the markings) just schedule it "as is" based on its DSCP markings?

And is HFSC a good scheduling strategy in SOHO/Home broadband applications where VoIP coexists? Or is RED better?

Thanks,

-Philip

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