vlan tags for voice

Unanswered Question
Nov 8th, 2007

Hi all, can anyone tell me why we untag the vlan for data, but tag for voice when using the same port, does the untagged vlan have to be the same between all trunk ports ?, and also if it is untagged, how does the next switch know what vlan the data has come from ?

I have this problem too.
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