This is something AT&T has tried to avoid, but was required to do by the FCC in 2007.
In response, the search giant has said, "Unlike traditional carriers, Google Voice is a free, Web-based software application, and so not subject to common carrier laws." But those 20 lawmakers have challenged that notion.
We’re more excited than ever to focus on building the next generation of iconic brands and life-changing products.All of which have a single purpose: to artificially stimulate massive increases in traffic." In other words, AT&T knows this dispute isn't about getting Google Voice to provide service to rural America -- it's about porn.