Question : Trixbox / create dial plan for channel spy

I found the following solution on Experts Exchange.
http://www.experts-exchange.com/Networking/Telecommunications/IP_Telephony/Asterisk_/Q_24552061.html

But I'm newbee to TrixBox / FreePBX

Can some one tell me step by step how to add the extension & dial plan in the solution above using the FreePBX web interface.

I'm missing some thing basic here!

Code Snippet:

         
           
           
             exten => 1000,1,Answer()
exten => 1000,n,Wait(1)
exten => 1000,n,Authenticate(007,a)
exten => 1000,n,Playback(pin-number-accepted)
exten => 1000,n,Wait(.5)
exten => 1000,n,Background(beep)
exten => 1000,n,Read(chan,,4)
exten => 1000,n,ChanSpy(SIP/${chan},q)
exten => 1000,n,Hangup()

           
         

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Answer : Trixbox / create dial plan for channel spy

Are you able to edit the file /etc/asterisk/extensions_custom.conf?

If so, add this line:
[from-internal-custom]
followed by the lines you already listed above from the previous question. Do a reload or dialplan reload (or just reboot/restart Trixbox).

However, if you are already using extension number 1000 for something else, then change all the 1000's to some number that is not already in use. For example:
[from-internal-custom]
exten => 1099,1,Answer()
exten => 1099,n,Wait(1)
... etc.