[US] An Emergency Communications Safety Net: Integrating 911 and Other Services / Congressional Research Service, 28 February 2008
PDF - http://assets.opencrs.com/rpts/RL32939_20080228.pdf
"The present capability and future effectiveness of America’s network of emergency telecommunications services are among the issues under review by Congress and other entities. Emergency calls (911) on both wireline (landline) and wireless networks are considered by many to be part of the public safety network. As technologies that can support 911 improve, many are seeing the possibility of integrating 911 into a wider safety net of emergency communications and alerts..."