If the 2N has a programmable relay which can momentarily close when somebody rings the bell, then you can buy one of these for around $125:
[Link: acnc.tech]?
You just need the controller and not any door station. The relay on the 2N would connect to the door 1 input on the DoorBell Fon controller which in turn is connected to the Panasonic phone system.
It wouldn't allow you to speak/listen to the person at the door.