| 摘要 |
The control respond to input dialling of certain number sequence, e.g. ''00'' for foreign calls, or ''019'', to characteristic part of preselection for special numbers.It prevents selection in other specified instances. The selection is also not executed, if the first figure of the given number is ''0'' and in specified cases. The method is easily set in practice by extra programming of the telephone appts. microprocessor.
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