| 摘要 |
<p>A register circuit in a PABX capable of accepting direct inward dialing is modified to generate hundreds digits when specific trunks are energized. The appearance of a signal over a selected one of the trunks will cause the register, in each instance, to produce a first digit in a hundreds counter. In this way, hundreds digits are supplied to the PABX without requiring an expenditure for a large number of additional selectors in the central office operating into the PABX. After the hundreds have been established, the tens and units digits are routed to appropriate tens and units counters.</p> |
