My SIP provider requires me to pass the caller ID number using the SIP from header and they ignore the value in the Remote Party ID field.

Is there a way to set a channel variable that will impact the SIP from header?

I've tried setting sip_from_user, sip_auth_username, user_name to the caller ID, but FreeSWITCH keeps defaulting to "FreeSWITCH" as the username.  

My sip profile simply looks like this:

  <include>
     <gateway name="myprovider">
       <param name="proxy" value="THE_IP"/>
       <param name="context" value="public"/>
       <param name="register" value="false"/>
     </gateway>
  </include>


Thanks!