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Your IP Phones must use the PBXtra as their primary DNS (see Why must I use the server as my Primary DNS?), but any computer attached to the LAN port on the back of the phones can have all DNS requests forwarded from the PBXtra to your actual DNS server.

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By enabling the DNS Forwarder option, you LAN will operate as follows:

IP Phones will use your PBXtra

/content/body/div[2]/ol/li[1]/span[1], reference to undefined name 'fon': line 1, column 1 (click for details)

Code Block

MindTouch.Deki.Script.DekiScriptUndefinedNameException: reference to undefined name 'fon': line 1, column 1
  at MindTouch.Deki.Script.DekiScriptVar.Evaluate (MindTouch.Deki.Script.DekiScriptEnv env) [0x00000] 
  at MindTouch.Deki.Script.DekiScriptAccess.Evaluate (MindTouch.Deki.Script.DekiScriptEnv env, Boolean evaluateProperties) [0x00000] 
  at MindTouch.Deki.Script.DekiScriptAccess.Evaluate (MindTouch.Deki.Script.DekiScriptEnv env) [0x00000] 
  at MindTouch.Deki.Script.DekiScriptCall.Evaluate (MindTouch.Deki.Script.DekiScriptEnv env) [0x00000] 
  at MindTouch.Deki.Script.Dom.DekiScriptDomExpr.Evaluate (MindTouch.Deki.Script.DekiScriptEvalContext context, System.Xml.XmlNode parent, MindTouch.Deki.Script.DekiScriptEnv env) [0x00000]

as their Primary DNS server. The phones search for the IP of the server hostname ( sNNNN.pbxtra.fonality.com (

/content/body/div[2]/ol/li[1]/span[2], reference to undefined name 'fon': line 1, column 1 (click for details)

Code Block

MindTouch.Deki.Script.DekiScriptUndefinedNameException: reference to undefined name 'fon': line 1, column 1
  at MindTouch.Deki.Script.DekiScriptVar.Evaluate (MindTouch.Deki.Script.DekiScriptEnv env) [0x00000] 
  at MindTouch.Deki.Script.DekiScriptAccess.Evaluate (MindTouch.Deki.Script.DekiScriptEnv env, Boolean evaluateProperties) [0x00000] 
  at MindTouch.Deki.Script.DekiScriptAccess.Evaluate (MindTouch.Deki.Script.DekiScriptEnv env) [0x00000] 
  at MindTouch.Deki.Script.DekiScriptCall.Evaluate (MindTouch.Deki.Script.DekiScriptEnv env) [0x00000] 
  at MindTouch.Deki.Script.Dom.DekiScriptDomExpr.Evaluate (MindTouch.Deki.Script.DekiScriptEvalContext context, System.Xml.XmlNode parent, MindTouch.Deki.Script.DekiScriptEnv env) [0x00000]

)

Any PC attached to the LAN port on the back of the phone will send DNS requests to your PBXtra . Your PBXtra

/content/body/div[2]/ol/li[2]/span[1], reference to undefined name 'fon': line 1, column 1 (click for details)

Code Block

MindTouch.Deki.Script.DekiScriptUndefinedNameException: reference to undefined name 'fon': line 1, column 1
  at MindTouch.Deki.Script.DekiScriptVar.Evaluate (MindTouch.Deki.Script.DekiScriptEnv env) [0x00000] 
  at MindTouch.Deki.Script.DekiScriptAccess.Evaluate (MindTouch.Deki.Script.DekiScriptEnv env, Boolean evaluateProperties) [0x00000] 
  at MindTouch.Deki.Script.DekiScriptAccess.Evaluate (MindTouch.Deki.Script.DekiScriptEnv env) [0x00000] 
  at MindTouch.Deki.Script.DekiScriptCall.Evaluate (MindTouch.Deki.Script.DekiScriptEnv env) [0x00000] 
  at MindTouch.Deki.Script.Dom.DekiScriptDomExpr.Evaluate (MindTouch.Deki.Script.DekiScriptEvalContext context, System.Xml.XmlNode parent, MindTouch.Deki.Script.DekiScriptEnv env) [0x00000]

. Your

/content/body/div[2]/ol/li[2]/span[2], reference to undefined name 'fon': line 1, column 1 (click for details)

Code Block

MindTouch.Deki.Script.DekiScriptUndefinedNameException: reference to undefined name 'fon': line 1, column 1
  at MindTouch.Deki.Script.DekiScriptVar.Evaluate (MindTouch.Deki.Script.DekiScriptEnv env) [0x00000] 
  at MindTouch.Deki.Script.DekiScriptAccess.Evaluate (MindTouch.Deki.Script.DekiScriptEnv env, Boolean evaluateProperties) [0x00000] 
  at MindTouch.Deki.Script.DekiScriptAccess.Evaluate (MindTouch.Deki.Script.DekiScriptEnv env) [0x00000] 
  at MindTouch.Deki.Script.DekiScriptCall.Evaluate (MindTouch.Deki.Script.DekiScriptEnv env) [0x00000] 
  at MindTouch.Deki.Script.Dom.DekiScriptDomExpr.Evaluate (MindTouch.Deki.Script.DekiScriptEvalContext context, System.Xml.XmlNode parent, MindTouch.Deki.Script.DekiScriptEnv env) [0x00000]

will then immediately forward these requests to your actual company DNS server. Because both the PBXtra

/content/body/div[2]/ol/li[2]/span[3], reference to undefined name 'fon': line 1, column 1 (click for details)

Code Block

MindTouch.Deki.Script.DekiScriptUndefinedNameException: reference to undefined name 'fon': line 1, column 1
  at MindTouch.Deki.Script.DekiScriptVar.Evaluate (MindTouch.Deki.Script.DekiScriptEnv env) [0x00000] 
  at MindTouch.Deki.Script.DekiScriptAccess.Evaluate (MindTouch.Deki.Script.DekiScriptEnv env, Boolean evaluateProperties) [0x00000] 
  at MindTouch.Deki.Script.DekiScriptAccess.Evaluate (MindTouch.Deki.Script.DekiScriptEnv env) [0x00000] 
  at MindTouch.Deki.Script.DekiScriptCall.Evaluate (MindTouch.Deki.Script.DekiScriptEnv env) [0x00000] 
  at MindTouch.Deki.Script.Dom.DekiScriptDomExpr.Evaluate (MindTouch.Deki.Script.DekiScriptEvalContext context, System.Xml.XmlNode parent, MindTouch.Deki.Script.DekiScriptEnv env) [0x00000]

and your computers all exist on the same LAN, this forwarding operation is so fast that you will not notice any lag at all when browsing external domains (the web, an external FTP server, an off-site data center via VPN, etc.)

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