Patent ID: 7447765
Filing Date: 2008-11-04
Classification: H04L,H04W

Abstract:
1. A method for processing an emergency call from an anonymous user device in a packet data network communication system, the user device having an identity that is not valid for non-emergency use of the packet data network communication system, the method comprising: receiving an attach request message and an activate packet data protocol (PDP) context request message from an anonymous user device, the attach request message including at least an identity for the user device and the activate PDP context request message including at least a protocol configuration options information element; determining whether the identity for the user device is valid for non-emergency packet data communications in the packet data network communication system; determining whether the protocol configuration options information element indicates an emergency context; in the event that the protocol configuration options information element indicates an emergency context and the identity for the user device is not valid for non-emergency packet data communications in the packet data network communication system: receiving data packets while the PDP context for the emergency call is active; determining whether the received data packets include the interim IP address and the at least one authorized IP address; in the event that the received data packets include the interim IP address and the at least one authorized IP address, routing the received data packets between the interim IP address and the at least one authorized IP address; and in the event that the received data packets include the interim IP address but not the at least one authorized IP address, blocking the received data packets from being routed in the packet data network communication system to thereby prohibit communication between the interim IP address and unauthorized IP addresses while the PDP context for the emergency call is active.