Patent ID: 9247418
Filing Date: 2016-01-26
CPC Classification: H04L,H04W

Claim Text:
1. A computer-implemented method comprising: receiving, at a serving call session control function (S-CSCF) address server, key information indicating that a S-CSCF is an assigned server for a user device, wherein the S-CSCF address server is to provide communication session termination for the user device in an event that a home subscriber server (HSS) is unavailable, and the key information includes a unique identifier associated with the user device, and an S-CSCF address of the S-CSCF; determining whether a data record based on the key information exists in the S-CSCF address server, wherein the data record includes the unique identifier associated with the user device, the S-CSCF address of the S-CSCF, and a validity period of registration of the user device; updating the data record based on the key information in response to a determination that the data record based on the key information exists in the S-CSCF address server; creating a new data record based on the key information in response to a determination that the data record based on the key information does not exist in the S-CSCF address server; and wherein each data record in the S-CSCF address server is searchable based on each unique identifier of the user device to provide an S-CSCF address of a serving S-CSCF associated with a corresponding user device.