Hi hpFAN12
I understand you want to know if you can set the phone to ring instead of the printer and if the printer is turned off will you still receive phone calls.
I will be happy to assist you with this.
The answer would be yes to both questions. Volume settings are on the printer, and the phone will still work with the printer off.
I have included the manual. To access the volume settings on the printer select the setup, (wrench) system setup, volume settings.
If you need more assistance just let me know.