Multiplex communications – Pathfinding or routing – Combined circuit switching and packet switching
Reexamination Certificate
2004-06-02
2009-06-02
Nguyen, Steven H (Department: 2419)
Multiplex communications
Pathfinding or routing
Combined circuit switching and packet switching
C370S401000
Reexamination Certificate
active
07542462
ABSTRACT:
Multicasting and telephony call signaling are combined to perform multicast call signaling. Several IP endpoints in a packetized network subscribe to a multicast group. A telephony call setup request is then sent on a multicast address to each of the subscribing endpoints in the telephony multicast group. When an originating endpoint transmits a telephony call setup request using the multicast address, the network replicates and transmits the telephony call setup request to each of the subscribing endpoints belonging to the telephony multicast group associated with that multicast address. When the setup request reaches the subscribing endpoints, each endpoint sends an alert signal using the multicast address to indicate the presence of a telephony device at that endpoint. Telephony devices at each of the subscribing endpoints can then begin notifying a user of the incoming call. When a response to the telephony call setup request is initiated by one of the telephony devices, a connect signal is transmitted from a responding endpoint using multicast address. A connection is then established between the originating endpoint and the responding endpoint. The multicast address or a point to point connection can be used to carry the voice and/or video data in addition to the signaling data once the connection is established.
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Cisco Technology Inc.
Nguyen Steven H
Stolowitz Ford Cowger LLP
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