ISNULL()
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ISNULL() 

ISNULL(value)

Returns 1 if value is NULL (kein Wert), otherwise returns 0.

exten => 123,1,Set(foo=${ISNULL(${Var1})})
[Note]

Internal help for this application in Asterisk 1.4:  

  -= Info about function 'ISNULL' =- 

[Syntax]
ISNULL(<data>)

[Synopsis]
NULL Test: Returns 1 if NULL or 0 otherwise

[Description]
Not available

diff output to internal help in Asterisk 1.2:  

- none -
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