Cisco Technology, Inc.

Thomas Joseph Bova

Kenneth Alfred Morneault

Diane M Berg

Larry Earl Peterson

Spyridon Dimitrios Tsitsonis

William Spencer Smart, Ii

Anant Rajabhau Ghotkar

Theodore S Krivoruchka, Jr

A Voice over IP network having multiple signaling message transfer nodes (e.g., call agents, signaling gateways), communicate with switched circuit network nodes using a single point code. A signaling gateway, upon receiving an SS7 signaling message specifying a destination point code corresponding to its provisioned point code and carrying a signaling application protocol message, selects a destination call agent based on the originating point code in the SS7 signaling message and independent of the destination point code. The signaling gateway selectively outputs to the selected destination call agent an IP-based message carrying the signaling application protocol message according to a prescribed IP-based signaling message transport protocol, based on a determined availability of the selected destination call agent. The signaling gateway uses the User Part Unavailable message to inform the originating PSTN switch that the selected destination call agent is unavailable.

Arrangement for sharing a single signaling point code between multiple hosts in an IP-based network

A method and apparatus are provided for providing continuous voice and call communications between a data network and a telephony network. In one configuration, a first gateway controller that receives the communications from the data network is coupled multiple sessions to a gateway that couples the communications to the telephony network. When the in-use session fails, the communications are automatically switched over from this session to the another session, while maintaining the voice and call communications without interruption, and while ensuring that all messages generated by the gateway are sent to the gateway controller. In another configuration, first and second gateway controllers are designated as Active and Standby. Each of the gateway controllers maintains one or more sessions in communication with the gateway. When the Active gateway controller fails or operator requests a gateway controller switchover, the communications are automatically switched so that communications are directed to the second gateway controller. Accordingly, fault-tolerant voice communication over a packet-switched data network, such as the Internet, is provided. Message queuing may be used to ensure that gateway messages are not lost and reach the gateway controller.

Method and apparatus for providing continuous voice and call communications between a data network and a telephony network

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Arlington, VA, United States of America

Thomas Joseph Bova