Patent ID: 7715821
Filing Date: 2010-05-11
Classification: H04M

Abstract:
1. A method of updating a unique call back number for a wireless unit having originated an emergency call, comprising: receiving a second unique call back number and a mobile equipment identity at a first network controller from a second network controller, the first network controller handing off the wireless unit to the second network controller; transmitting the second unique call back number and the mobile equipment identity from the first network controller to a first emergency response register associated with the first network controller via a first interface; transmitting the second unique call back number and the mobile equipment identify from the first emergency response register to a second emergency response register associated with a public service answering point via a second interface different from the first interface; assessing a first and second entry for the wireless unit based on the mobile equipment identity, the first entry being stored at the first emergency response register associated with the first network controller, the second entry being stored at the second emergency response register associated with the public service answering point, the first and second entry including a first unique call back number being keyed on the mobile equipment identity; and updating the first unique call back number for the wireless unit by writing over the first unique call back with the second unique call back number at the first and second entries; the second unique call back number includes a first set of digits identifying the second network controller, and a second set of digits identifying the emergency call originated by the wireless unit, the second set of digits distinguishing the emergency call originated by the wireless unit from other emergency calls, and the first set of digits corresponds to a local public safety number.