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US 8,149,820 B2Granted
Method and apparatus for supporting circuit switched interworking
AssigneeInterDigital Technology Corporation
InventorKamel M. Shaheen
Life of this patent
Estimating the term…
Abstract
A wireless system performs interworking of a combined circuit switched (CS) session and an IP multimedia core network subsystem (IMS) session between two users having different content capabilities through an interworking circuit switched (CS) and IMS function (IMS CS IWF).
Claims7
A method for use in a network node, the method comprising:
- the network node receiving, from a first wireless transmit/receive unit (WTRU), a Session Initiation Protocol (SIP) Invite message that indicates a request for a second WTRU to participate in a combined circuit-switched (CS) and IP Multimedia Subsystem (IMS) session with the first WTRU, wherein the combined CS and IMS session between the first WTRU and the second WTRU includes a CS call at the second WTRU and a PS session at the second WTRU, and a voice over IP (VoIP) call at the first WTRU;
- the network node communicating with the second WTRU to establish the combined CS and IMS session;
- and
- the network node sending a SIP OK message to the first WTRU, wherein the SIP OK message indicates that the second WTRU has accepted the combined CS and IMS session.
1 more element
Dependencies are inferred from the claim text.