a method , and an associated computer program product and computer system . one or more processors of a first computer located in a building monitor outgoing calls from a telephone in the building . the monitoring identifies an outgoing call dialed from the telephone . the one or more processors determine that the identified outgoing call is a telephone number of an emergency response center . in response to determining that the outgoing call is the telephone number of the emergency response center , the one or more processors transmit , via a communications network , emergency data having relevance to an emergency at the building to a second computer of the emergency response center and to emergency responders available to respond to the emergency at the building . the emergency responders are associated with the emergency response center . the emergency data transmitted to each emergency responder is specific to each emergency responder .