| 摘要 |
The method restricts the call like the long-distance or international call according to the authorised grade of the telephone. The call restriction code is installed in the memory table directly by the user. The stored program is always changed by the user necessary, but not changed even though the telecommunication system is altered. The code is entered after the sharp key, and checked its grade code. The input for the code is completed after entering the sharp key again. If the asterik key is entered, it regards to the no conditional key so that all entered numbers are rejected or allowed. Blut in case of the hold key, all numbers and asterik key stored in the present memory table are cleared, and the process is completed.
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