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

Claim 10:
11. A non-transitory computer readable medium having stored thereon computer readable code executable by a processor 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:
receive, from the first mobile device, a first identity, wherein the first identity is received in an information element of a cellular protocol message;
receive 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;
determine that 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.