| 摘要 |
A method and apparatus for allowing a conventional caller identification adjunct device to support spontaneous call waiting identification service. During an ongoing call, CPE alerting signals indicating a second, incoming call are received by a converter device which mutes a line to the connected telephone and responds with the appropriate DTMF signal. Following the correct response, the telephone company sends information in an FSK format which describes the number and name of a second caller. Upon receiving the FSK information, the converter adds the appropriate protocol information to the FSK information so that it can be understood by the CID display device. The modified information is then transferred to the CID display device where it is displayed.
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