T-mobile Innovations LLC

Harikishore Allu Balan

Saqib Badar

Shujaur Rehman Mufti

Methods, media, and systems are provided for continuity of a telecommunications network service in an IP Multimedia Subsystem (IMS) layer providing telecommunications network services to devices located on an island. The IMS layer may comprise a Call Session Control Function (CSCF) or an application server. A diameter routing agent (DRA) or other diameter traffic controller associated with the CSCF transmits a request to a Home Subscriber Server (HSS) (e.g., that is located on a mainland). The CSCF, application server, or both have a skip HSS flag comprising instructions for connectivity loss with the HSS. Based on determining a loss of connectivity with the HSS, a Serving CSCF associated with the island is automatically selected or the Serving CSCF automatically transmits a response indicating the request was successful registering a user device, such that the user device continues working remotely on the island.

Network service continuity in IP multimedia subsystem layer

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.

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Snohomish, WA, United States of America

Harikishore Allu Balan