US 2024/0205268 A1Published application

Serving call session control function (cscf) restoration with proxy cscf binding

AssigneeT-Mobile USA, Inc.

InventorsHarikishore Allu Balan, Saqib Badar

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Abstract

Systems, methods, and devices that relate to prompt restoration of Internet Protocol (IP) Multimedia Subsystem (IMS) services when a Serving Call Session Control Function (S-CSCF) becomes unavailable are disclosed. In one example aspect, a method for wireless communication includes receiving, by a first network node in a network, a user profile associated with a user device from a home server configured to manage subscriber information. The user profile comprises binding information about a Proxy Call Session Control Function (P-CSCF) that is in communication with the user device. The method also includes retrieving, by a second network node, the binding information of the P-CSCF upon a third network node being unreachable for completing a call for the user device to enable a completion of the call for the user device.

Claims20

Dependent claims

A system for wireless communication, comprising:

a Proxy Call Session Control Function (P-CSCF) that is in communication with a user device in a network;
a first Serving Call Session Control Function (S-CSCF);
a first Telephony Application Server (TAS) in communication with the first S-CSCF,
wherein the first TAS is configured to store a user profile associated with the user device in a location that is accessible to one or more TASs in the network, and
wherein the user profile comprises binding information of the P-CSCF that is in communication with the user device;
a second S-CSCF that is selected upon the first S-CSCF being unreachable to other network nodes in the network;
and
a second TAS in communication with the second S-CSCF,
wherein the second TAS is configured to retrieve the binding information of the P-CSCF from the location that is accessible to the one or more TASs in the network, and
wherein the second S-CSCF is configured to:
receive the binding information of the P-CSCF from the second TAS;
and
transmit a message to the P-CSCF based on the binding information of the P-CSCF to complete a communication for the user device.

10 more elements

Dependencies are inferred from the claim text.