asterisk/doc/README.math

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Mathematical functions application
Yeah, I thought it was a little insane too..
adds:
Sum, Multiply, Divide, Subtract, Modulus, GT, LT, GTE, LTE, EQ functions to asterisk
All functions follow the same basic pattern for parameters:
parameter 1 = the name of the return variable
parameter 2 = the operation
parameter 3 = the second number
Each action is perfromed as
Action param1 on param2
eg:
Action = Divide
Param1 = 10
Param2 = 2
Results in
Divide 10 by 2
Example dialplan:
exten => 11099,1,Math(RV,1+20)
exten => 11099,2,NOOP(${RV})
exten => 11099,3,Math(RV,10*2)
exten => 11099,4,NOOP(${RV})
exten => 11099,5,Math(RV,10*2)
exten => 11099,6,NOOP(${RV})
exten => 11099,7,Math(RV,10-2)
exten => 11099,8,NOOP(${RV})
exten => 11099,9,Math(RV,2%10)
exten => 11099,10,NOOP(${RV})
exten => 11099,11,Math(RV,10/0)
exten => 11099,12,NOOP(${RV})
exten => 11099,13,math(RV,10-200)
exten => 11099,14,NOOP(${RV})
exten => 11099,15,Math(RV,1-20)
exten => 11099,16,NOOP(${RV})
exten => 11099,17,Math(RV,1<20)
exten => 11099,18,NOOP(${RV})
exten => 11099,19,Math(RV,1>=20)
exten => 11099,20,NOOP(${RV})
exten => 11099,21,Math(RV,101>20)
exten => 11099,22,NOOP(${RV})
exten => 11099,23,Math(RV,1==20)
exten => 11099,24,NOOP(${RV})
exten => 11099,25,Math(RV,20<=20)
exten => 11099,26,NOOP(${RV})