Is this speed test good or bad?

Hi,Just found this site and hope someone can explain the speed test result.  I'm using several Vonage lines (two of their adapters) on a Comcast cable connection.The jitter number (you -> server) = 1.9msPacket loss is 0Packets out of order is 0Number of supported voip lines = 18Maximum download pause = 160msAverage download pause = 13msQuality of service = 30%The "summary" page has four green balls that say my voip quality should be good.  But there's a red ball for QoS and it says my voip calls are likely to be "broken."My Vonage voice calls actually sound pretty good and not "broken" at all.  How significant a factor is the QoS if everything else is good?Is there something I can do to improve the QoS?  Is that something that Comcast can fix and, if so, what exactly should I tell them or ask for?