If the mere mention of MOS (Mean Opinion Score) conjures up some high level sales terminology that’s meant to gloss over the details and provides little impact to troubleshooting VoIP QoS, then don’t worry because you are not alone. Over the past few years, I’ve noticed a growing trend amongst our technology peers who have similar feelings when discussing MOS as a factor of visibility to VoIP networks. Most anecdotal responses to my queries of dismissal end in “…I can’t fix my network using MOS.” So I ponder the dismissal; Has the audience expertise surpassed the oversimplified value of MOS? Has MOS outgrown it’s value in how we operate our VoIP networks? or is there something more subtle creating the perception of dismissal?