We use Dell PowerConnect 35xx switches and I want to know the best way to handle VLANs and our VoIP. Currently I simply have two VLANs (100=data; 200=phone). PCs and phones do not share jacks, so each switch port is in access mode and assigned to one VLAN or the other as appropriate. The ports going between the switches are in trunk mode and carry both VLANs.
At the switch that connects to the router (Internet) I use a separate port for each VLAN; each going to a separate port on the router. That way I can assign higher priority to the traffic on the voice VLAN. (Not sure if that is the "normal" way to do it -- but it was what made sense to me :-)
At times of heavy data usage we occasionally get some "chop" on our voice lines. I don't know if it's being caused at the router, switch(es) or both. However, I want to eliminate it anywhere I can. I notice that the switches have something called Voice VLAN, but I don't understand what the difference is between that and a regular VLAN. Is it something I can use to give the voice traffic higher priority at the switch level? And if so, how would I set it up?