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Emergency call handling

  • US 8,787,867 B2
  • Filed: 01/27/2009
  • Issued: 07/22/2014
  • Est. Priority Date: 01/27/2009
  • Status: Active Grant
First Claim
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1. A user terminal for use with a communications system, the user terminal comprising:

  • a non-volatile memory;

    a subscriber identity authentication unit configured in use to communicate with a removable subscriber identity module and with said communications system in order to authenticate a subscriber identity stored in said subscriber identity module;

    a recording unit for recording a used and authenticated subscriber identity in said non-volatile memory; and

    an emergency call initiation unit configured to initiate an unauthenticated emergency call in the absence of a subscriber identity module, to provide a user terminal identity in place of the subscriber identity in a call setup request during the initiation, and to retrieve said used and authenticated subscriber identity from said non-volatile memory and to provide the retrieved subscriber identity to the communications system during the initiation,wherein the unauthenticated emergency call is an emergency call in which a subscriber is not fully authenticated or registered,wherein said user terminal identity is an International Mobile Equipment Identifier (IMEI) identity.

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