Anyone know where I can get a replacement night bell for an Mitel SX-50? Thanks.
Any straight line ringer will work. You 'COULD' even use a 2500 set, but don't expect to answer the call with the same set! As I recall ITT (and WE) model 139BA works just fine. It's nothing more than the bells and isolation capacitor from a 2500 set in a box. If you want something LOUD, consider Edwards or Wheelock.