Method and system for establishing emergency call

Details Method and system for establishing emergency call Method and system for establishing emergency call

2009-01-13

2011-10-18

Sheikh, Ayaz (Department: 2476)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

C370S466000, C455S404100, C455S561000

Reexamination Certificate

active

08040905

ABSTRACT:
A method for establishing an emergency call includes: if an emergency call request message sent by a User Equipment (UE) contains an Internet Protocol Multimedia Subsystem Public User Identity (IMPU) in a TEL URI format, a Proxy-Call Session Control Function entity (P-CSCF) generates an IMPU in a Session Initiation Protocol (SIP) URI format according to the IMPU in the TEL URI format, sends both IMPUs to a Public Safety Answering Point (PSAP), and receives an emergency callback initiated by the PSAP. The PSAP initiates the emergency callback according to one of the two IMPUs. A system for establishing an emergency call includes a UE, a P-CSCF and a PSAP. The PSAP can always acquire the IMPU in the TEL URI format and the IMPU in the SIP URI format of the UE, and initiate an emergency callback to the UE according to the IMPU in the SIP URI format.

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3GPP TS 24.229 V7.4.0 (Jun. 2006). Technical Specification. 3rd Generation Partnership Project; Technical Specification Group Core Network and Terminals; IP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3 (Release 7).

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