| 摘要 |
A method of communicating FSK-modulated Caller ID signals through a network incompatible to the transmission of these signals is presented. A first network component couples between the incompatible network and a Central Office, and a second network component couples between the incompatible network and the telephone. In one embodiment, the call flow proceeds until the second network component would ring the line of the called party. The second network component seizes the line but does not apply a ringing signal. The second network component continues with the call flow as though the second network component had entered the silent interval after the first ring cycle at the called party. Subsequently, the CO transmits the FSK Caller ID information to the first network component which detects the FSK transmission and converts it into an out-of-band message and transmits the out-of-band message over the incompatible network to the second network component. Upon receipt of this out-of-band message from the first network component, the second network component converts it back into an in-band FSK Caller ID message, and delivers the FSK message during the first silent interval.In another embodiment, the first network component, without sending signals to the second network component, initiates a call flow to the CO as though the second network component were entering the silent interval. Subsequently, the CO transmits the FSK Caller ID information to the first network component which detects the FSK transmission and converts it into an out-of-band message for transmission to the second network.
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