title: SIPp - How to generate a random number in SIPp scenario?
body: <p>Currently, I need to run SIPp scenario to simulate a large of call for loading test.
  In the script of the caller, after receiving 200 OK message and before sending BYE message, I need to pause a duration to simulate for call duration as follows:</p>
  
  <p>Caller:</p>
  
  <p>Invite -------------></p>
  
  <p>...</p>
  
  <p>200 OK &lt;----------</p>
  
  <p>ACK    --------------></p>
  
  <p><strong>pause milliseconds="xxx"</strong></p>
  
  <p>BYE    --------------></p>
  
  <p>I need to generate random value for <strong>XXX</strong> to simulate for the different call durations which is similar to real calls.</p>
  
  <p>I tried to generate random values in .csv file and get these values into caller script, but it's not successful. I get an error like this:
  "Pause milliseconds, ... is not a floating point number!"</p>
  
  <p>How can I generate a random value in a SIPp script?</p>