I posted a traffic shaping sample (my VoIP is Vonage) several months
ago.  It uses 1 pipe in each direction with 3 queues in the pipes. 
Beside the VoIP queue there is a "normal" traffic queue and a "bulk"
queue.  The whole thing has been running for many months and works
just fine.  I never have any problems with my VoIP or normal (mostly
web browsing) traffic - the bulk just get's stolen from as needed.

On 5/16/05, Michael Sierchio <kudzu at tenebras dot com> wrote:
> Chris Bagnall wrote:
> 
> > Can some kind soul explain why even when I have queues defined as follows:
> > High Priority weight: 80
> > Regular               weight: 19
> > Bulk          weight: 1
> >
> > BitTorrent transfers (which end up in the "bulk" queue) still end up
> > destroying any hope of an audible VoIP call?
> 
> Perhaps you need to make the queues smaller -- again, unless the higher
> weight (WEIGHT IS NOT PRIORITY! WEIGHT IS NOT PRIORITY! WEIGHT IS NOT PRIORITY!)
> queue is full, the weights are irrelevant.
> 
> Queues need to be of appropriate size, sharing a pipe of appropriate size,
> and you need a full set of each in each direction.
> 
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