Conversational bearer negotiation
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United States of America Patent
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-
Jan 25, 2011
Grant Date -
Dec 9, 2004
app pub date -
Feb 12, 2004
filing date -
Feb 15, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A method of setting up a session between peer user terminals of a communication system, wherein at least one of the user terminals is a dual-mode terminal having access to both an IP-based packet-switched access network and a circuit-switched access network, and the session extends at least in part across the circuit-switched access network. One of the user terminals initiates the session by sending Session Initiation Protocol (SIP) signaling to a SIP server over the IP-based network. The SIP server sends a notification to a gateway server to establish one or more conversational bearers. The gateway server then sends a callback telephone number to the dual-mode terminal. The dual-mode terminal then calls the callback number to establish a circuit-switched session with the gateway server.
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