I am looking for suggestions for a door phone.
Currently my customer has 2 Avaya Door Phone Model LUADS.
When we took over from their Avaya system we connected them to the SL ports (I Think).
They have gotten water into them and have gradually had more audio issues until now when it is basically a glorified door bell.
They have some nice brickwork outside and these connect to a 6x6 plastic box, so I need a solution that uses the same box. This also needs to withstand being outside and functional at -40C and +35C
Any ideas?