Patent ID: 11963060
Assignee: APPLE INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method, comprising:
performing, over a wireless local area network, an IP multimedia subsystem (IMS) registration via a non-3GPP interworking function (N3IWF) or evolved packet data gateway (ePDG);
establishing connection over one or more of a first 3GPP network and a second 3GPP network;
determining that the first 3GPP network:
does not support voice communications for a device; or
supports only fallback to the second 3GPP network for voice communications;

originating or receiving a voice call via the N3IWF or ePDG;
disabling a capability associated with the first 3GPP network based on one of:
(a) IMS registration via the N3IWF or ePDG; or
(b) originating or receiving a voice call via the N3IWF or ePDG;

handing over the voice call from the wireless local area network directly to the second 3GPP network using a second 3GPP cellular radio access technology (RAT) in response to disabling the capability associated with the first 3GPP network; and
enabling the capability associated with the first 3GPP network based on one of:
(a) IMS deregistration via the N3IWF or ePDG; or
(b) ending of the voice call.