RAND : Asterisk function to choose a random number
RAND : Asterisk function to choose a random number
rand function is use to choose a random number in a range. Range has to be set between minimum and maximum number. This would be useful in many scenario based on implementation logic. some of the examples are :
- Setting of random caller id
- Setting of random trunk for dialing
- Disconnect call by random duration
Check if RAND function is available
CLI> core show function RAND
How to use RAND function
RAND([min][,max])
Choose a random number between min and max. Min defaults to 0, if not specified, while max defaults to RAND_MAX (2147483647 on many systems).
What this function returns
RAND function return a single random number from minimum and maximum range.
exten => s,1,Set(satya=${RAND(1,10)})
; - Sets a value of a variable to a random number between 1 and 10.
Example to use random outbound trunk
if we had 5 outbound gateway, we wanna use it equally, try this:
exten => _09XXXXXXXX,1,Set(VOLUME(RX)=5)
same => 2,Goto(${RAND(3,7)})
;set priority number from 3~7 random
same=> 3,Dial(SIP/${EXTEN}@gateway0)
same=> 4,Dial(SIP/${EXTEN}@gateway1)
same=> 5,Dial(SIP/${EXTEN}@gateway2)
same=> 6,Dial(SIP/${EXTEN}@gateway3)
same=> 7,Dial(SIP/${EXTEN}@gateway4)
