Bob Eager pretended :
We have IP phones around the house (a lot of them). We also have
dedicated numbers for each member of the household. The phones ring
differently according to which person's number is being called.

The 'ring tone' is the Morse for each person's initial.

I would not go that quite far

I have though assigned different ring tones to different people who
might ring, based on whether they might be ringing for me or for Jean,
or for either of us.