I have a quick question about QOS on SPA phones and ESW switches and what the best practice is. Do the SPA phones mark their packets at both layer 2 and layer 3? If they do, what markings do they use? COS 5 for layer 2 and EF for layer 3? When setting up QOS on an ESW switch, is it best to leave it at the default advanced mode? Or is it better to set QOS on the switch to basic and set it to trust either cos or dscp?
Thanks in advance,