Patent ID: 7006829
Filing Date: 2006-02-28
Classification: H04W

Abstract:
1. A method of routing a telephone call, comprising: receiving the call at a mobile switching center from a mobile unit in signal communication with a cellular telephone system; directing the call from the mobile switching center to a redundant service control point, each mobile switching center directing calls to a single redundant service control point in response to a geographic location of the mobile switching center, the redundant control point implement by multiple service control points implementing common features or a single service control point employing redundant features; in response to the call, the redundant service control point accessing a portion of a geographic database, portions of the geographic database being uniquely associated with respective redundant service control points wherein each of the redundant service control points accesses a geographic database containing only the geographic data pertinent to a coverage area for each redundant service control point; and the redundant service control point routing the call based at least partially on the geographical location and independent of the number plan area code of the mobile unit; wherein routing the call includes routing the call to a public safety answering point servicing the geographical area of the mobile unit.