Image via CrunchBase
Three letters were issued by the FCC on July 31st, one to AT&T, one to Apple, and one to Google.
Letter to AT&T concerning Apple's rejection of the Google Voice for iPhone Application. http://hraunfoss.fcc.gov/edocs_public/attachmatch/DA-09-1737A1.pdf
Letter to Google concerning Apple's rejection of the Google Voice for iPhone Application. http://hraunfoss.fcc.gov/edocs_public/attachmatch/DA-09-1739A1.pdf
Letter to Apple regarding Google Voice and related iPhone applications. http://hraunfoss.fcc.gov/edocs_public/attachmatch/DA-09-1736A1.pdf