quarefellah
When operating the 146 we were provided a lightweight telex (850 I think) which was slightly more usefull than tits on a bull (Aussie vernacular meaning useless). I used my own DC h10-80 until I purchased a Bose X, which was fantastic.
Standard dual jack plug fit in all of our 146s.
The flight deck is quite noisy, and the interphone system to the cabin crew sucks.