QoS For VoIP Traffic on Sonicwall

I want to configure Sonicwall NSA 3500 to dedicate bandwidth for 3 VoIP remote users. If anyone can help it would be appreciated.
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DarinTCHSenior CyberSecurity EngineerCommented:
not to steal any thunder

we did have something like this in past here

http://www.experts-exchange.com/Hardware/Networking_Hardware/Firewalls/Q_26396398.html -- they said

 configure the total available bandwidth on your interfaces first, and then you configured the QOS rules in each individual firewall rule, for prioritization or bandwidth guarantee's etc.
Determine how much egress and ingress bandwidth you have.  go to network > interfaces and edit the WAN interface.  go to the last tab and enable BWM entering your bandwidth.  make sure you enter it correctly.  then, go to Firewall and create your LAN > WAN rules to control bandwidth utilization.  When you enable BWM, a new tab is added to the firewall rules window that appears.

and I have watched a youtube about sonicwall QOS also like 30 + minutes

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DivOphAuthor Commented:
I have enabled BWM . . . we have a 20Mb connection and it is set as our Ingress and Egress values. I want to guarantee in and out bandwidth for anyone accessing our phone system using the external IP. Can you talk me through the logic?
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