Thus spake "Bill Woodcock" <firstname.lastname@example.org>
QoS is completely unnecessary for VoIP. Doesn't appear to make a
bit of difference. Any relationship between the two is just FUD from
people who've never used VoIP.
To paraphrase Randy, I encourage all of my competitors to think like this.
Iff you operate a network with enough excess capacity to keep jitter and
packet loss within acceptable limits, you do not need QOS. Most real
networks are far from that ideal, however.