| 摘要 |
A system for establishing a virtual facility connection so that services provided by a main location private branch exchange are accessible by affiliated or remote locations via a concentrator, such as a relatively small on premises asynchronous transfer mode switch, that transmits/receives control signals to and from the private branch exchange over the Internet or a private data network. Terminals at affiliate or remote locations are connected to the main location PBX by way of a concentrator, an "always on" connection link, a public network and an Internet interface. For relatively small remote locations, virtual connections are established via the Internet, whereas for larger locations a physical connection is formed using the corporation's own private network. This system for tapping into the services provided by a main location PBX at a remote location terminal is less expensive than conventional private tie lines.
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