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Vlan config question for voip deployment?

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Vlan config question for voip deployment?

Hello,
Im deploying some ip phones along with an ippbx and just had a question regarding vlans using the sonicwall enhanced os on nsa240. Want to make sure i have vlan and qos setup properly. I have a few cisco sg300 28 port switches that I have researched how to configure the vlans on, I have also researched how to give the phone themselves a vlan tag (say vlan200) from within their web gui as well. I was hoping that someone could help me with the sonicwall part of it all. It acts as our firewall/router and need to configure it for the vlans. I only have one drop in each office so the phone and pc will share switch port. I would have 3 of these switches because we have 3 separate building. From what I can see, I would give the phone a vlan tag that matches what I setup in the switch vlan200. So when they fire up, they know to look for the vlan200 dhcp and get the correct address info. What do I do with sonicwall? Just setup vlan as a subinterface on the lan interface and give it the 200id, or do I need to configure a completely separate physical interface like x3, or x4 for this vlan. Any help would really be appreciated, and let me know if you need anymore details about the network setup. I dont necessarily need these two subnets to talk to each other, but would like both to have access out of the sonicwall to the interent. Thanks again..