Who is credited with suggesting the word hello be used when answering the telephone?

The telephone was never suppose to be a device that had a ring, but an open line between two parties for business. A greeting wasn't needed. Bell suggested that the Word "ahoy" be used. It was Edison who came up with "hello" according to the archives of the American Telephone and Telegraph company. Dated Aug 15, 1877 a letter to the president of the central district and printing telegraph company in Pittsburgh. By 1880 hello was what was said and was the right way to answer the phone.