HELP !! 23 BUTTON (12 PIN) pcb

I OPENED AN OLD TELEPHONE I HAD IN MY HOUSE

im a total beginner in Electronics & Arduino... but I opened that old telephone and retrieved a 23 button pcb with 12 pin.... following its circuits, I noticed it was connected to a Winbond chip (didnt find any schematics) supposedly to handle numbers, on hold and wait buttons for the telephone....

is there any way I can repurpose this 23 numbers pcb without the winbond chip?

with only 12 pins ???? please help meee :D

Pictures, and you forget to add the circuit...?

Cheers, Kari