Over the past few months, we've been following the FCC's inquiry into Apple and AT&T after they rejected Google Voice from the App store. A couple weeks ago, AT&T did their best to deflect the FCC by dangling a shiny object in front of them — the use of Google Voice to block calls. It now appears the FCC has taken the bait, as they've sent an official inquiry to Google asking why the service restricts connections. "In its letter, the FCC asked Google to describe how its calls are routed and whether calls to particular numbers are prohibited. It also asks for information on how restrictions are implemented, how Google informs customers about those restrictions, whether Google Voice services are free, and if Google ever plans to charge for them in the future." Richard Whitt has already posted a brief explanation on Google's Public Policy blog. "The reason we restrict calls to certain local phone carriers' numbers is simple. Not only do they charge exorbitant termination rates for calls, but they also partner with adult sex chat lines and 'free' conference calling centers to drive high volumes of traffic." The FCC also received a push from members of the House of Representatives on Wednesday.