| 摘要 |
A data communication method and apparatus, in particular an interface, for connecting a data terminal, either directly or indirectly, to a digital communications link.A call progress signal is received from a telephone network and call progress data is sent over a digital communications link in response thereto wherein either the data includes information relating to the frequency of the call progress signal or one of a predetermined set of codes relating to the type of call progress signal is selected and sent over the link.
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