Pinless from a trunk

The scenario is 2 Freepbx boxes connected togheter via an Intercompany IAX trunks. On the BOX A there is a PIN policy for the outgoing call on the outside world SIP trunk. We would like to have the PIN policy normaly managed on the extension locally registered on the BOX A (as it is already done) but no PIN policy on the call to the SIP trunk coming from the IAX trunk.
Any suggestion?
Thank you