<extension name="tollfree">

     <condition field="destination_number" expression="^(\+1|1)?(8(00|88|77|66)[2-9]\d{6})$">

       <action application="set" data="bypass_media=true"/>

       <action application="bridge" data="sofia/external/1$2@sip.tollfreegateway.com"/>

     </condition>

   </extension>

Problem:

FS is not passing 200 OK to inbound leg when it received from outbound leg