Thanks for replying. I'm not quite sure what you mean in your second paragraph. I won't be leaving a faulty (or unsuitable) keypad installed, risking the security of the building if that's what you mean. I would imagine it'll either work or not. The equipment is ours and we wanted the company to replace the keypad, they couldn't source one but I can, they will fit it but not support it.
I think all I'm asking is if it's a simple job to swap a keypad over? i.e. do these keypads generally need programming to the system, or do they just need the correct address?
To answer your question, yes it's a monitored system so someone gets a phone call