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Call establishment method of number portability user to be called, I-CSCF (interrogating call session control function) and IMS (IP multimedia subsystem)

A technology of I-CSCF and number portability, which is applied in network data management, electrical components, wireless communication, etc., and can solve the problem that the original network cannot complete normal service connection.

Inactive Publication Date: 2013-05-01
CHINA TELECOM CORP LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The number portability user is called: According to the IMS service process, the call is routed according to the SIP URI. When the portability user is called, the S-CSCF on the calling side sends the called SIP URI information to the domain name system DNS (Domain Name System). Name System) to analyze, because the domain name of the ported user’s SIP URI is still the domain name of the ported IMS, the call will be routed to the original contracted network of the called party, but the user has already moved out, and the original network cannot complete the normal service connection

Method used

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  • Call establishment method of number portability user to be called, I-CSCF (interrogating call session control function) and IMS (IP multimedia subsystem)
  • Call establishment method of number portability user to be called, I-CSCF (interrogating call session control function) and IMS (IP multimedia subsystem)
  • Call establishment method of number portability user to be called, I-CSCF (interrogating call session control function) and IMS (IP multimedia subsystem)

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Embodiment Construction

[0029] The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are illustrated. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] The present invention overcomes that the call service cannot be applied when the number portability transfer user is called, and saves the original public user identifier of the user and the user's number portability transfer network in the HSS of the first s...

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Abstract

The invention discloses a call establishment method of a number portability user to be called, an I-CSCF (interrogating call session control function) and an IMS (IP multimedia subsystem) and relates to the technical field of number portability. The call establishment method comprises the following steps that a calling which is started for the number portability user is routed into the I-CSCF in the IMS domain with which the number portability user signs a contract for the first time; the I-CSCF acquires a new public user identity from an HSS (home subscriber server) in the IMS domain with which the number portability user signs the contract for the first time; the new public user identity is identified to be the public user identity which is distributed for the number portability user through an IMS domain to which the number portability user transfers; and the I-CSCF uses the new public user identity to establish a call of a calling party on the number portability user. The call establishment method of the number portability user to be called, the I-CSCF and the IMS provide a call service of the user to be called when the user performs number portability.

Description

technical field [0001] The present invention relates to the technical field of number portability transfer network, in particular to a call establishment method, I-CSCF and IMS in which a number portability transfer network user is called. Background technique [0002] Number portability means that the user changes the contracted operator without changing the user number or user ID. There are two types of user identifiers in the IMS domain: SIP URI (username domain name) or TELURI (telephone number) domain name), different operators use different domain names. The number portability of the IP Multimedia Subsystem IMS (IP Multimedia Subsystem) system means that a user transfers to a new network by carrying the public user identity (including the domain name) assigned by the network for the first subscription. An IMS user transfers the number portability to another IMS domain, and the user obtains a new private user identity after porting into the IMS network. There are t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/06H04W8/04
Inventor 朱小景
Owner CHINA TELECOM CORP LTD
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