| 摘要 |
When a terminating call is forwarded by a CTI-enabled switch (50, 52) to an off-switch destination (42), the associated CTI controller (12) is notified of the delivery of that call and in response the controller records that destination number as busy and invokes a call back when free request in respect of the destination number. When a notification is received at the CT I- enabled switch (50, 52) that the destination number has become free, the controller (12) is notified, and in response records the destination number as free. The CTI-enabled switch (50, 52) may comprise a switch (50) in combination with a telephony card (52).
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