Grimmax:
Ringing Line Priority or Ringing Line Preference is enabled in Station Programming and typically not the function of a feature code. For starters, please let us know the system you have and that will assist in looking up how to program the feature. If you don't know the system, flip the telephone over and give the Part Number. Also, on the KSU (The telephone system box typically mount on a backboard in a closet or back room) will have a sticker on it with the system make and model. That would be most helpful as well.