Patent ID: 11889589
Assignee: APPLE INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. The method of claim 11, further comprising:
with the proxy server, receiving carrier configuration file information from a carrier configuration file server;
with the proxy server, while the first communications link is unavailable, receiving configuration data from the first user equipment over the second communications link;
with the proxy server, identifying, based on the configuration data and the carrier configuration file information, a network address of the network node;
with the proxy server, after the network address of the network node has been identified, transmitting an authentication request to an authentication server via the network node;
with the proxy server, receiving a response to the authentication request from the authentication server through the network node, the response to the authentication request being addressed to the proxy server;
with the proxy server, transmitting the response to the authentication request to the first user equipment over the second communications link;
with the proxy server, receiving a subscriber identity module (SIM) challenge response from the first user equipment over the second communications link;
with the proxy server, transmitting the SIM challenge response to the authentication server via the network node;
with the proxy server, receiving, via the network node, an acknowledgement indicative of the SIM challenge response being verified by the authentication server; and
with the proxy server and after the acknowledgement has been received, transmitting, via the network node and a network tunnel extending from the proxy server to the network node, an IP Multimedia Subsystem (IMS) registration request to the authentication server.