I have in hand one of these RCA ViSYS 4-line phones. The user manual is showing you need two separate jacks with CO lines 1 & 2 going to one and CO lines 3 & 4 going to the other (brown and orange unused on both 568B jacks).

I'm still confused how I will move lines 3 and 4 from the brown and green pairs on my 66 lock to the second jack for lines 3 & 4 into the blue and green positions without doing any kind of funky stuff with jackleg cables or splitters on the station end.


Jeff
Lead Field Engineer, MSCNS