Patent ID: 11864265
Assignee: T-MOBILE USA, INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. The method of claim 5:
wherein the first proxy node and the second proxy node each comprises a proxy-call session control function (P-CSCF);
wherein the call session control function comprises a serving-call session control function (S-CSCF);
wherein the subscriber information node comprises a home subscriber server (HSS) and/or a unified data management function (UDM);
wherein the management node comprises a session management function (SMF) or a mobility management entity (MME);
wherein at least one of the first message triggering proxy node restoration or the second message triggering proxy node restoration comprises a P-CSCF restoration indication;
wherein the session initiation message comprises a session initiation protocol (SIP) message; and
wherein the status repository comprises a network repository function (NRF).