I try to use function MATH or GoToIf for checking the negative value
but CLI shows an error as following.
exten => s,11,Set(bt=${MATH(-1>0)})
func_math.c:164 builtin_function_math: '' is not a valid number
exten => s,11,GoToIf($[-1 < 0]?20)
WARNING[12926]: ast_expr2.y:729 op_negate: non-numeric argument
It seems both functions can't accept negative number for comparison.
What function can I use to compare negative number?
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