fe31nz:The FritzBox can do all the QoS it likes, but without somehow tagging the packets, the upstream routers will not give them any priority, so when the traffic merges with other customers' traffic, the VOIP packets would be treated as normal packets and risk getting dropped anywhere there is congestion. Once the VOIP packets reach 2D's routers, those routers could be automatically giving the VOIP traffic priority (maybe by adding appropriate tags), but in between, in the Chorus network, their documentation makes it pretty clear that they expect the packets to have the 802.1Q PRI tags set for traffic to be given priority. In the absence of congestion, that does not matter much, but as more and more people connect to fibre, there will be congestion problems eventually. So it is much better to discover problems like this now and get them fixed.
Thanks, that makes sense. It'll be interesting to see what happens as fibre uptake increases I guess.