[Serusers] Dial Plans

[POON Ben]

Hi,
 
I need help with setting up a dial plan.
 
Basically, I want to do this:
If my phone #'s are 111-222-xxxx where xxxx is the extension, I want to
be able to call xxxx instead of the full 10 digits when calling within
the local loop.
 
I tried looked for dial plans with SER online but found very little
information.  Any help is greatly appreciated.
 
I've tried using prefix option without luck.  This is what I had:
  if(!uri=~"sip:111.*")
    {
     prefix("111222");
    };
 
When I try to call using just the extension, I get a busy tone.  Are
there any special modules I need?  And are there any good tutorials on
creating dial plans and how to set them up?
 
I hope I posted the question to the right place, if not please let me
know where I should ask.
 
Thank you very much,
Ben
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