Have the invention. The phone will change the audio signal as an electrical signal sent to the destination phone phone line will serve the electric signal conversion back into audio signals intact.
You have to invent the telephone. The phone will have to change the sound into electrical impulses sent along a telephone line. Then phone destination will serve to convert the electrical signal back to sound the same.
Had the invention of the telephone. The phone will change the audio signal into an electrical signal sent by cable. Then the phone will be converted to electrical signal destination that is an audio signal intact.