Patent ID: 8472588

Claim:
An emergency call service system in an Internet Protocol (IP) network, comprising: a policy control server for determining and generating position information of a user terminal by mapping an IP address and local information to an identification (ID) of the user terminal, wherein the position information is determined based upon interface ID information of a data transmission concentrator; an emergency call agent for detecting, based upon the position information, a suitable emergency center for the user terminal sending an emergency call, and make an emergency-call connection between the user terminal and the emergency center; a call agent for relaying the emergency call of the user terminal to the emergency call agent; a network manager storing position information of the user terminal generated through the policy control server, provide the emergency call agent with the position information of the user terminal sending the emergency call, and perform a resource reservation for the emergency-call connection, wherein the policy control server comprises: a dynamic host configuration protocol (DHCP) server for allocating an IP address in response to an IP address allocation request message transmitted from the user terminal; a policy server for generating position information of the user terminal by mapping the IP address and the local information to the ID of the user terminal, and provide the generated position information of the user terminal to the network manager; and a data storage unit for storing the position information of the user terminal generated through the policy server, and wherein the IP address allocation request message is a “DHCP request” message and wherein the ID of the user terminal is the interface ID of the concentrator.