Patent ID: 8787867
Filing Date: 2014-07-22
Classification: H04L,H04W

Abstract:
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.