The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 21, 2025
Filed:
Aug. 22, 2022
T-mobile Usa, Inc., Bellevue, WA (US);
Xavier Ligeret, Seattle, WA (US);
T-Mobile USA, Inc., Bellevue, WA (US);
Abstract
Methods and systems for a location-based serving call session control function (S-CSCF) selection in an IP multimedia subsystem (IMS) network is disclosed. According to an implementation, an interrogating CSCF (I-CSCF) of an IMS network receives a request to register a user equipment (UE) to use an IP multimedia service. The request may be a session initiation protocol (SIP) register. The I-CSCF determines that the UE is located in a first region based on the geographic information in the request. The I-CSCF may determine, based at least in part on the cell global identity (CGI) information in the SIP register, that the UE is previously registered through a different region. The I-CSCF may determine a serving CSCF (S-CSCF) located in the first region to provide the IP multimedia service to the UE. The I-CSCF further registers the UE on the S-CSCF.