Patent ID: 11888906
Assignee: BLACKBERRY LIMITED
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 20:
21. A non-transitory computer readable medium having stored thereon computer readable code executable by a processor of a first mobile device to hand off a circuit switched (CS) communication with a second mobile device from a CS network to a packet switched (PS) network by causing the processor to:
determine that the first mobile device should attempt to handoff the CS communication to the PS network;
send a first identity, wherein the first identity is sent in an information element of a cellular protocol message;
send a Session Initiation Protocol (SIP) message for a PS communication, the SIP message including a second identity in a format of a Unified Resource Name (URN) in an instance identifier (ID) contained within the SIP message, wherein the CS communication and the PS communication originate from the first mobile device when the first identity matches the second identity;
continue the PS communication with the second mobile device via the PS network; and
drop the CS communication with the second mobile device.