Who ACTUALLY Invented the Telephone?

Did Alexander Graham Bell actually invent the telephone? How about Elisha Gray? Or what about Antonio Meucci who both Italy and even U.S. Congress at one point acknowledged as the true inventor of the telephone... But is there any actual truth to his story, or was it a major flub by Congress? And what about the oft' forgotten Johann Philip Reis who there was even a bonafide conspiracy to suppress…