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Method and system for routing a telephone call

  • US 7,006,829 B2
  • Filed: 05/14/2003
  • Issued: 02/28/2006
  • Est. Priority Date: 05/14/2003
  • Status: Expired due to Fees
First Claim
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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.

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