| 摘要 |
An interface device (3) for placing a call from a local telecommunications device (1) to a remote terminal (5) via a selected telecommunications signal carrier, wherein the local telecommunications device is connected to a local telecommunications exchange, the interface device comprising: memory means (11) for storing a plurality of carrier identifiers, and corresponding variable costing information for each carrier; detecting means (7) for detecting a remote terminal identifier emitted from said local telecommunications device; processing means (9) for comparing the variable costing information corresponding to each stored carrier identifier with call characterisation information and selecting an optimal carrier to establish the call, and for adding a prefix representative of the selected carrier to the remote terminal identifier; and, switching means (6) for sending the prefix and the identifier to the local telecommunications exchange for writing to the telecommunications signal carrier, so that the carrier is able to establish a connection between the local telecommunications device and the remote terminal.
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