[Freeswitch-users] Hunting Phase Problem

[hi tanin]

I am very new with FreeSwitch. Can anyone tell me:
    What is mean by hunting phase?
    When and how it is use and why and when it is required?
I want to know details about hunting phase, 
 
Also plese give me a way or tell me when and how the variables($0, $1, $2) are used?
 
Please help me 
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