I am using shorewall as my firewall and traffic shaping platform; however, I'm wondering what more I can do to help mitigate upstream jitter issues.  I have a fair amount of bandwidth, but the connection is not stable and enough so that jitter causes VoIP calls to be choppy.I am already shaping the VoIP traffic and assigning it the highest priority.  I am planning to switch from guaranteeing 80% of the bandwidth to a set limit of 1Mb/s which should be more than sufficient.Is there something more I can do, if so, at which level?  The problem with the call quality happens at both ends.  If I implement some sort of buffer on my end, that will fix the call choppiness when I attempt to hear others, but what can I do to fix others hearing me?
shorewall - VoIP - jitter buffer
networking;qos;voip;shorewall