Patent ID: 9106742
Filing Date: 2015-08-11
Classification: H04L,H04M

Abstract:
1. A method comprising: defining an emergency session initiation protocol public user identity at a server in an internet protocol multimedia subsystem network, wherein the emergency session initiation protocol public user identity is uniquely associated with a user of a called device, wherein the emergency session initiation protocol public user identity is generated by converting a phone number associated with a call, wherein the server associates the emergency session initiation protocol public user identity with the called device, and wherein the emergency session initiation protocol public user identity is one of a set of session initiation protocol public user identities associated with the user; receiving a request for the call from a calling device, wherein the request comprises the emergency session initiation protocol public user identity; determining if an identifier of the calling device is in a white list for utilizing the emergency session initiation protocol public user identity; causing an alert to be rendered via the called device if the identifier of the calling device is in the white list, wherein the alert indicates that the call is an emergency communication, wherein the alert enables a previously coupled call to be interrupted in order to receive the call from the calling device; modifying, if the identifier of the calling device is not in the white list, the emergency session initiation protocol public user identity to create a new emergency session initiation protocol public user identity, wherein the new emergency session initiation protocol public user identity has a lower priority than the emergency session initiation protocol public user identity; and causing the call to be connected.