I use line 1 and line 2 to CO line 3 has never been used line 4 to front door and line 5 intercom found both t&r broken were connected to the 66 block in KSU repaired now have dial tone to the 2564 sets how ever the VX41 has no line light on L3 possibly my wiring to L3 in the KSU is wrong as I'm color blind and use the wife to decipher the colors. We will check the colors tonight after her school thanks


Tim