I think the above line is part of the problem. The "+30" literally means 'watch for these tones for 30 milliseconds, and then don't watch any more.' I think what you want here is +30000. Can you try that and see if there's a difference?
 

Here's a simple extension that I use for recording. It uses the uuid of the call for the file name. I don't know if the "pre_answer" application is absolutely necessary or not, but I do it just to be certain that I get the early media.

<extension name="record early media">
  <condition field="destination_number" expression="^82(\d+)$"> <!-- 82 + phone number -->
      <action application="bridge" data="sofia/default/$1@172.20.191.228"/>
      <!-- we can skip all this early media stuff if the far end answers -->
      <action application="set" data="execute_on_answer=transfer ANSWERCALL XML default"/>
      <action application="sleep" data="100"/>
      <action application="pre_answer"/>
      <action application="record_session" data="/tmp/${uuid}__1.wav"/>
      <action application="sleep" data="500"/>
      <!-- If call gets here then probably we're in progress media; get ready to handle various tones -->
      <!-- Look for busy and SIT tones right away, then wait a bit before looking for a ring signal -->
      <action application="tone_detect" data="BUSY 480,620 r +25000 set BUSY=true"/>  <!-- detect busy -->
      <action application="tone_detect" data="SIT1LO 913.8 r +25000 set SIT1LO=true"/>   <!--1st segment low -->
      <!-- ... look for other SIT tones if you need to; snipped from this example -->
      <!-- Now sleep while other end is ringing -->
      <action application="sleep" data="25010"/>
      <!-- if far end answers then we never get here...-->
      <!-- Use Lua script to check value of BUSY, SIT1LO, etc. -->
      <!-- If !BUSY and !SIT1LO, etc. then call is a no answer -->
      <!-- I use extensions for each scenario, e.g.
        <condition field="destination_number" expression="ANSWERCALL">
        OR
        <condition field="destination_number" expression="BUSYCALL">
        etc.
      -->
  </condition>
</extension>

In any case, if you call a busy number it should record the early media. You can change the sleep time from 25010 to a shorter duration, like maybe 10000. You could also insert an info app to dump the channel variables and see if tone_detect set your channel variable(s).

Hope this helps!
-MC