Patent ID: 8553682
Filing Date: 2013-10-08
Classification: H04L,H04M,H04W

Abstract:
1. A method implemented in a first wireless transmit/receive unit (WTRU) for communication with a second WTRU via a wireless network, the first WTRU being configured to support a circuit switched (CS) voice call and an IP multimedia core network subsystem (IMS), the method comprising: receiving a Session Initiation Protocol (SIP) Invite message that indicates a request for the first WTRU to participate in a combined CS and IMS session with the second WTRU, wherein the combined CS and IMS session includes a CS call and a PS session at the first WTRU, and a voice over IP (VoIP) call at the second WTRU; and sending a SIP OK message to the second WTRU in response to the SIP Invite message.