| 摘要 |
PURPOSE:To inform simply a return schedule time of a called party by inform ing the return schedule time from an exchange in an audible tone to a caller to a telephone set whose return schedule time is registered. CONSTITUTION:When a subscriber 1A hooks off, since an outgoing register ORT 4 sends a dial tone via a subscriber circuit LC2 and a switch SW 3, a return schedule time registering special number is dialed. The dialed number is decided by a central processing unit CPU 7 as the return schedule time registering special number. Then the subscriber 1A dials the return schedule time in response to the length of time. When a call comes from a subscriber 1B, an audible tone corresponding to a numeral read from a time notice tone outgoing trunk TIT 5 is sent to the subscriber 1B via the switch SW 3 and the subscriber circuit LC 2. The subscriber 1B listens to the intermitted audible tone and recognizes the return schedule time depending on the number of signals consecutive for a short time repeated during a long period.
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