anchor.diff:  | 4 | CS 4
   |===
   
  -The content of this attribute is not used by OsmoBTS, but
  +This attribute is not used by OsmoBTS, but
   simply passed to OsmoPCU connected to the PCU socket.
   
   
  
positive.code: The countdown value specifies the RLC CV value from which the countdown
  procedure is started.
  
  The content of this attribute is not used by OsmoBTS, but
  simply passed to OsmoPCU connected to the PCU socket.
  
  
  
negative.code: 
  All of these additional IEs are _received_ by OsmoBTS.
  
  These attributes are not used by OsmoBTS, but
  simply passed to OsmoPCU connected to the PCU socket.
  
  .Additional IEs handled by OsmoBTS but not defined in TS 12.21
  