| 摘要 |
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 (2) is passed through a gateway computer (3) to a backbone packet-switched network (5), and then through a second gateway computer (6) to a second circuit-switched network (7) 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 (3) and then converted back to voice by the far-end gateway computer (6). In an alternative scenario, the originating party uses a computer (4) on the packet-switched network (5), which replaces the originating circuit-switched network and the originating computer.
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