METHOD OF SESSION PROCESSING IN AN IMS AND INTERROGATING-CALL STATE CONTROL FUNCTION

Title:

METHOD OF SESSION PROCESSING IN AN IMS AND INTERROGATING-CALL STATE CONTROL FUNCTION

Document Type and Number:

WIPO Patent Application WO/2007/025480

Kind Code:

A1

Abstract:

A method of session processing in the Internet Protocol (IP) Multimedia Subsystem (IMS) comprises: Interrogating-Call State Control Function (I-CSCF) accessing the Home Subscriber Server (HSS) to query the registration location of the called user, the I-CSCF sending the Session Initiation Protocol (SIP) request to the Serving-Call State Control Function (S-CSCF) based on the response of the HSS; when the response time of the S-CSCF to the SIP request sent from the I-CSCF has expired, the I-CSCF re-selecting the S-CSCF, and sending the SIP request to the S-CSCF. And an Interrogating-Call State Control Function is provided. According to the present invention, if the S-CSCF returned by the HSS to process the unregistered service of the IMS user does not responded because of the device failure or communication interruption or the like, the I-CSCF can re-select other S-CSCF to process the unregistered service of the IMS user, so as to improve the quality of service and to increase the satisfaction of user.

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Inventors:

LI CHANGLIN (CN)
ZHU FENQIN (CN)
ZHAO JIANGUO (CN)
WANG JING (CN)
HE XIAOYAN (CN)

Application Number:

PCT/CN2006/002244

Publication Date:

March 08, 2007

Filing Date:

August 31, 2006

Export Citation:

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Assignee:

HUAWEI TECH CO LTD (CN)
LI CHANGLIN (CN)
ZHU FENQIN (CN)
ZHAO JIANGUO (CN)
WANG JING (CN)
HE XIAOYAN (CN)

International Classes:

H04L12/24

Domestic Patent References:

WO2004045195A1	2004-05-27
WO2003005669A1	2003-01-16

Foreign References:

CN1414775A	2003-04-30
CN1655546A	2005-08-17

Other References:

ROSENBERG J. ET AL.: "SIP: Session Initiation Protocol", RFC 3261, 31 July 2002 (2002-07-31), XP002323877

Attorney, Agent or Firm:

BEIJING TONGDAXINHENG INTELLECTUAL PROPERTY AGENCY LTD. (NO.34 Xueyuannanlu Road Haidian District, Beijing 8, CN)

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