Give this a try. hangup_after_bridge is implied if you continue_on_fail.  And you usually don't want to continue if the first call is answered and hungup properly.

<extension name="admins_local">

   <condition field="destination_number" expression="^admins|8031$">

       <action application="set" data="continue_on_fail=NORMAL_TEMPORARY_FAILURE,USER_BUSY,NO_ANSWER"/>

       <action application="set" data="call_timeout=10"/>

       <action application="bridge" data="sofia/default/1000%$${domain}"/>

       <action application="answer"/>

       <action application="playback" data="/home/mkrivushin/fs/mobile.wav"/>

       <action application="bridge" data="sofia/public/982314123423@192.168.0.8"/>

  </condition>

</extension>

/b