[Freeswitch-users] Random number generation

[KSrigo]

Hi Chris,

I’m not sure if I understood exactly your needs. This is how I use randomize function:

Define Random Number Generator extension:

<extension name="random_number_gen" continue="true">
  <condition field="destination_number" expression="^random_number_gen$" break="never">
    <!-- generate random number between 1 and 100 -->
    <action application="set" data="rand_val=${expr(randomize(&x);ceil(random(0,100,&x)))}" inline="true"/>
    <action application="log" data="INFO Random value is ${rand_val}"/>
  </condition>
</extension>


then call it in your diaplan each time you need to get a random number set:

<action application="execute_extension" data="random_number_gen XML from-core"/>


Regards,
Srigo


> On Jan 24, 2017, at 9:51 AM, Chris Young <Chris.Young at enghouse.com> wrote:
> 
> Hello all,
>  
> On the wiki, there is an example of using mod_expr to generate a random number:
>  
>                 <!-- generate random number between 1 and 100 -->
>                 <action application="set" data="rand_val=${expr(randomize(&x);ceil(random(0,100,&x)))}"/>
>                 <action application="log" data="INFO Random value is ${rand_val}"/>
>  
> This works well the first time but if the same dialplan instructions are executed subsequently, the same number is produced each time.
>  
> Is this by design? Is there any other way to seed the random number generator so it will produce different results, as randomize() doesn't seem to be doing quite what I thought it would?
>  
> Many thanks,
> Chris
>  
> Chris Young 
> Software Engineer
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