| 摘要 |
A special service routing circuit provides for single digit access to service centers in a complex of buildings or a large multi-storied building, such as a motel or hotel, in such a way that particular centers can be accessed only by particular lines in accordance with their location. The routing circuit generates three digits to accompany the single dialed digit, which three digits will have a value depending on the location of the calling party for access to certain service lines.
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