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Asterisk func isnull

Synopsis:

 NULL Test: Returns 1 if NULL or 0 otherwise

Description:

 ISNULL(<data>)
 


Notes

  • *CLI> show function ISNULL

Return value

Returns 1 if NULL or 0 otherwise.

Example

exten => s,1,Set(foo=${ISNULL(${var1})})


See also

Created by: murf,Last modification on Fri 05 of Nov, 2010 [09:23 UTC] by admin


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