There were many versions of the "Princess".
https://en.wikipedia.org/wiki/Princess_telephoneYou may not be aware that you can only make calls from an OBi using Touch-Tone dialling. Rotary dial phones are not supported for initiating calls.
OBis are specced as being able to drive up to 5 REN.
https://en.wikipedia.org/wiki/Ringer_equivalence_number. Old phones usually have a REN of 1.
Newer phones can be significantly less. If your two radio phones are DECT handsets working from a single common base station it is only the base station that the OBi drives and those base stations invariably have REN much lower than 1.
So I would expect that a 202 can be connected to house wiring that has all your phones on it.
Before connecting a PHONE port on any Obi to house wiring ensure that any other phone service wiring is properly physically disconnected. Many posters here have found out the hard way that failure to do so runs a high risk of causing irreparable damage to an OBi which is outside the scope of the warranty.