I understand that a standard access port is not a trunk port, but you can allow two vlans voice and data vlans
Does a voice vlan on an access port basically have its packet all tagged which a voip phone can communicate with as its designed to work with tagged packets only.
And the data vlan basically has untagged traffic, which means all untagged traffic will be associated with the data vlan, as far as the data vlan is concerned its already in the correct vlan so simply does not care about tagged traffic.
I can understand the separation of voice traffic, you would not want a data network to be able to see voice packets for obvious security reasons. Plus I understand you can prioritise packets for voice for qos by separating the vlans. Basically does it work by sending all tagged voice packets first(voice vlan) then send the untagged data packets second(data vlan).