EXISTS()
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EXISTS() 

EXISTS(variable)

Checks to see if a variable is defined. Returns 1 or 0.

exten => 123,1,Set(Var1=test)
exten => 123,n,Set(Var2=)
exten => 123,n,Set(foo=${EXISTS(${Var1})})   ; foo is 1
exten => 123,n,Set(foo=${EXISTS(${Var2})})   ; foo is 0
[Note]

Internal help for this application in Asterisk 1.4:  

  -= Info about function 'EXISTS' =- 

[Syntax]
EXISTS(<data>)

[Synopsis]
Existence Test: Returns 1 if exists, 0 otherwise

[Description]
Not available

diff output to internal help in Asterisk 1.2:  

- none -
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