Brekeke SIP Server Wiki

$isNull

Check whether the specified SIP header, property variable or DialPlan method is null.

Syntax:
$isNull( name )
Parameters:

name – the name of the SIP header,  property variable or DialPlan method.

 

Returns:

true – if the specified SIP header, variable or DialPlan method is null.
false – otherwise

 

Version Since:

2.4

 

Example:
$isNull("$getSIPuser(From)”) = true

If the From-URI doesn’t have a user-part.

$isNull( “&my.val” ) = false

If the variable “my.val” is not null.

 

See Also:

$exist

Yes No
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