Call Session Control Function (CSCF) reselection in wireless communication networks
US12149566B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 5, 2023 |
| Grant date | Nov 19, 2024 |
| Priority date | — |
| Expiry date | Jul 5, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L65/1104
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Various embodiments comprise a wireless communication network to support Internet Protocol Multimedia Subsystem (IMS) voice calling. In some examples, the wireless communication network comprises Call Session Control Function (CSCF) circuitry and E.164 Number Mapping (ENUM) circuitry. The CSCF circuitry receives a Mobile Originating Session Initiation Protocol (MO IMS) invite message from an originating User Equipment (UE). The CSCF circuitry performs an ENUM query for the destination number to route the invite to the terminating UE network. The ENUM circuitry responds with routing information and realm information for the terminating UE. The CSCF circuitry stores the realm type in association with the MO SIP invite and transfers the MO SIP invite. The CSCF circuitry receives an error response from the peer network for the SIP invite. The CSCF circuitry determines if retry is allowed based on the realm type. If retry is allowed, the CSCF circuitry transfers a retry request.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.