What BC release are u using?
If u r using BC8 and if I remember correctly,there was a fault in OPI II consoles that caused one way speech on operator.firstly it was corrected by a patch and later a new Eprom for the console was released.
But this had notting to do with the number of operators.(I thought this might help,or may be not?)
Experience it, there is no substitute.
RemoveThisJazayeri@kiasagroup.com