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Methods, apparatus and computer program products for associating local telephone numbers with emergency phone calls in a packet switched telephone system

  • US 7,586,902 B2
  • Filed: 05/10/2004
  • Issued: 09/08/2009
  • Est. Priority Date: 05/10/2004
  • Status: Expired due to Fees
First Claim
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1. A method of routing phone calls in a packet switched telephone system, the method comprising:

  • in response to a phone call being directed to a called telephone number corresponding to an emergency number, substituting a local telephone number of a subscriber for a calling telephone number associated with the phone call, wherein the calling telephone number is different than the local telephone number, wherein the substitution of the local telephone number for the calling telephone number is carried out within a Voice Over Internet Protocol (VoIP) server; and

    routing the phone call with the substituted local telephone number based on the called telephone number to a Public Safety Access Point (PSAP), wherein the substituted local telephone number can be dialed by an operator at the PSAP to return the phone call to the subscriber through a Public Switched Telephone Network (PSTN).

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