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

Claim 0:
1. A method for handing off a circuit switched (CS) communication with a second mobile device from a CS network to a packet switched (PS) network, the method comprising:
receiving, from the first mobile device, a first identity, wherein the first identity is received in an information element of a cellular protocol message;
receiving 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;
determining that the CS communication and the PS communication originate from the first mobile device when the first identity matches the second identity;
continuing the PS communication with the second mobile device via the PS network; and
dropping the CS communication with the second mobile device.