Hybrid packet-switched and circuit-switched telephony system
Patent 7336649 Issued on February 26, 2008. Estimated Expiration Date: December 20, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
370/352, Combined circuit switching and packet switching370/401, Bridge or gateway between networks370/435, TASI (Time Assignment Speech Interpolation)379/88.03, Voice dialing370/458, Using time slots379/144.02, Collect calling from payphone379/100.13, Format conversion370/355, Routing packets through a circuit switching network370/466, Converting between protocols370/404, Ring or loop forms backbone for interconnecting other networks370/465, Adaptive370/496, Signaling370/395.61, Adapting constant bit rate (CBR) data (e.g., voice, or narrow band ISDN over ATM, or using AAL1)379/221.08Advanced intelligent network (AIN)
A hybrid telephony system with packet switching as well as circuit switching optimizes utilization of transport networks, and is accessible from any conventional telephone set. A call originating from a circuit-switched network is passed through a gateway computer to a backbone packet-switched network, and then through a second gateway computer to a second circuit-switched network where it terminates. The voice of both the originating party and the terminating party is converted to data packets by the near-end gateway computer and then converted back to voice by the far-end gateway computer. In an alternative scenario, the originating party uses a computer on the packet-switched network, which replaces the originating circuit-switched network and the originating computer. Powered by CPUs, DSPs, ASICs disks, telephony interfaces, and packet network interfaces, the gateway computers may have media conversion modules, speech processing modules and routing resolution modules, and are capable of translating telephony call signaling as well as voice between circuit-switched and packet-switched networks. Optionally, the gateway computers may also have analog trunking modules, MF and DTMF digit modules and special services modules, in order to support analog circuit-switched networks and secure telephone calls.
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