Patent ID: 7146001
Filing Date: 2006-12-05
Classification: H04M

Abstract:
1. In a central office switch serving a plurality of telephone lines, each line being defined by at least one common aspect, the aspect having plurality of values, a method comprising: determining if the directory number dialed for a current call is of a predetermined set of directory numbers defining an emergency-related call; determining if the value of the aspect was dynamically changed coincident to a previous call, the previous call defining one of: a just completed call or a first call in a series of emergency-related calls including the current call; if the directory number dialed for the current call is of the predetermined set of directory numbers defining an emergency-related call and the value of the aspect was not dynamically changed coincident to a previous call, dynamically changing the value of the aspect coincident to the current call; and if the directory number dialed for the current call is not of the predetermined set of directory numbers defining an emergency-related call and the value of the aspect was dynamically changed coincident to a previous call, reverting the value of the aspect to its value before it was dynamically changed.