Unlang - Adding attribute NAS-Port-Id where response = Access-Accept

Hello guys, I need to add attribute NAS-Port-Id and send this attribute with the same value of attribute UserName. I need to do this, because my accel-ppp needs attribute NAS-Port-Id to set the values of interfaces when client connect. I dont want to add this atrribute NAS-Port-Id in all users (mysql), i know if i do this, the problem is solved. But my freeradius operate together my ERP, and its terrible to contact the support and request this modification. I want to rewrite the Access-Accept adding NAS-Port-Id=UserName using UNLANG. I try to do this, but failed. Someone help me? Thanks :) *Att,* *Marcos Vinicius*