RAND： 产生随机数！

1. exten => _X.,1,Set(sjs=${RAND(1,4)})
2. exten => _X.,n,Noop(${sjs})
4. ;取1-4之间的随机数字，后面打印出来
5. 以下为官方的： 
    
   Asterisk func rand 
    
   Synopsis: 
         Choose a random number in a range 
    
   Description: 
         RAND(min,max) 
    
   Choose a random number between min and max. Min defaults to 0, if not 
   specified, while max defaults to RAND_MAX (2147483647 on many systems). 
    
   Notes 
    
       *CLI> core show function RAND 
    
       This functions is only availible in 1.4 and later. 
    
   Return value 
        Returns the resulting number. 
    
   Example 
   
   复制代码
   1. exten => s,1,Set(junky=${RAND(1,8)});
    
   - Sets junky to a random number between 1 and 8, inclusive. 

exten=>_x.,n,set(sjs=${RAND(0,9)},${RAND(0,9)},${RAND(0,9)}) 
exten=>_x.,n,NOOP(${sjs})