Patent ID: 7359373
Filing Date: 2008-04-15
Classification: H04L,H04M,H04W

Abstract:
1. A method comprising: sending a Session Initiation Protocol (SIP) INVITE message via an Internet Protocol Multimedia Subsystem (IMS) network to establish an IMS-specific service between a plurality of terminals coupled to the IMS network; establishing a SIP dialog between the plurality of terminals using the SIP INVITE message; communicating CS bearer information between the plurality of terminals via the SIP dialog by way of a Session Description Protocol (SDP) message having SDP extensions indicating the CS bearer information, wherein the CS bearer information includes at least an indication that a CS communication flow is requested via a CS network, and wherein the CS communication flow is bound together in the plurality of terminals with the IMS-specific service; parsing the SDP message in the plurality of terminals receiving the SDP message to determine the CS bearer information; and effecting the CS communication flow between the plurality of terminals via the CS network as directed by the CS bearer information and in conjunction with the establishment of the IMS-specific service.