I just had a read through that document last night. It's interesting to note that NZ is now abandoning the BT 3-wire system for a simple 2-wire hookup.

Other minor variations I noticed from the British influenced wiring:

Jack terminals are numbered the opposite way round to here. I'm assuming NZ adopted the original BT plug numbering. There was much confusion over here due to a monumental screw-up in communications which led to the plugs and sockets being numbered the opposite way round to each other.

The use of red/blue/green/white fixed wiring in older systems. They were the colors used for the flexible cords on phones here, but the old 4-wire fixed cable was blue/orange/green/brown.

The drawing to show the wiring conversion (last page) looks like it was copied directly from the old GPO 746 schematics, but as the phones were the same I suppose that's not surprising (except for your backwards dial, of course [Linked Image] ).