VOIP over VPN with cisco PIX series firewalls

Anyone have any experience with this? Our set up is fairly simple; we have

4 locations in 3 states connected via VPN over dsl lines of various speeds (1.5meg, 768, 768, 512 all asynchronous). VPN works great, but when I've experimented with netmeeting there is a 3 or 4 second lag in the voice and the video is pretty choppy. Do I need frame connections to take get the QOS that is needed or is it possible to make our set up work.

Thanks

Rich

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Rich
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