Asterisk provides the MATH function to do mathematical operations from dialplan. It allows to perform mathematical operations between two parameters.
The syntax for math function is
MATH(expression,type)
The operators supported by math function are
+,-,/,*,%,<<,>>,^,AND,OR,XOR,<,>,<=,>=,==
The possible output types are
f : float,
i: int,
h: hex ,
c: char
if type int is used for the math function, all the decimals from output will be removed.
Examples
division with output type as float
exten => 111,1,Set(i=${MATH(30/60,f)})
output : 0.500000
division with output type as integer
exten => 111,1,Set(i=${MATH(30/60,i)})
output : 0 // integer type removes all the decimal part from output
modular division with output type as integer
exten => 111,1,Set(i=${MATH(1%2,i)})
output : 1
