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Computer and phone on different vlans but in same access port?

I'm a little confused on how this works, I'm hoping someone can clarify it for me. On our network we have VOIP service on VLAN 200, Data on VLAN 300. Our switchports I believe are defined as access ports, which means they should only have 1 VLAN (I don't know what the VLAN is on the access port - I assume 200 or 300). But the telephone plugs directly into the switchport then the computer plugs into the PC port on the back of the phone. How is it that this works? It seems to my befuddled brain that this means there are 2 seperate VLAN's sending info on the switchport - the phone over 200 the PC over 300.

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justin_grswld

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Steven Carnahan

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steven smith

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Yes, I was able to gain access to the switch and you are correct - it does specify "switchport voice vlan 200". I take it from your immediately identifying it as a Cisco switch (it is) that this isn't common? Most layer2/3 switches CAN'T do that? How would the whole pc-plugged-into-the-phone work in that case - both have to be on the same VLAN or no vlan at all? Curious about that for new deployments, but trying to figure out the best (and least expensive) way to do a new deployment on current equipement here. Trying to see if we have a Cisco with 1 free port but 5 computer / phone pairs to connect if we can simply use a standard 10/100/1000 switch plugged into that Cisco port, then the phone / computer pairs plugged into that switch. The switch isn't VLAN aware, so it should just pass the info along and the port on the Cisco will sort it out and not care about the switch or the fact that there are 10 devices working off it, correct? Thanks, you have been most helpful so far.

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Steven Carnahan

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UnHeardOf

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steven smith

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Not sure I understand why it wouldn't work - same 2 VLAN ID's (one specified as the voice) - what is different between having 1 pair connected of 5 pairs connected through a switch?

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Steven Carnahan

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steven smith

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Thanks guys, between the lot of you I understand this a LOT better now.