hi I have few extensions in freepbx showing as registered but with some unknown string.
607/607-9e7a15e4cee61196d D N A 5090 OK (6 ms)
605/605 D N A 5090 OK (121 ms)
606/606 D N A 5090 OK (106 ms)
484/484-47eb434b9152ec097 D N A 5090 OK (290 ms)