| 摘要 |
A telephone call forwarding device enables call forwarding instructions to be given over the telephone for which call forwarding service has been procured from a second telephone line connected to the device. A ring signal detector, in response to a preselected number of rings on the second phone line, causes the second phone line to be seized for a short cycle period in which an authorization signal can be received by the device. If an authorization signal is received during that period, a long cycle timer is activated which maintains seizure of the second phone line for a long cycle period. During that long cycle period, a repeat timer repetitively and alternatingly causes the procured service phone line to be seized for an interval in which call forwarding instructions can be relayed from the second phone line and to release the procured service phone line for an interval whose duration enables a new dial tone to be obtained on the procured service phone line at the beginning of the next interval for giving call forwarding instructions.
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