Title: Arrangement serving operator assistance calls requiring routing back to originating offices

Abstract: An additional concentrator is provided in a Traffic Service Position System (TSPS) similar to that disclosed in A. E. Joel, Jr. Pat. No. 3,731,000, issued May 1, 1973, to facilitate the handling of operator assistance telephone calls requiring routing back to originating offices. More specifically, on the toll office side of this additional concentrator in addition to the normal TSPS remote toll trunks, "loopback" trunks are provided for establishing connections through this concentrator directly back to a plurality of "local" offices served by the concentrator. Operator assistance calls in which only a single digit (normally 0) is dialed are connected to these loopback trunks with the expectation that the call will be completed back to the originating or associated office. If, however, the calling party later indicates to the operator that the call is actually destined for a telephone station accessible through the toll office, then the original concentrator connection is broken-down and a new connection is established between the calling station and one of the TSPS remote toll trunks.

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Inventors: Joel, Jr., Amos Edward (South Orange, NJ, US)

Application Number: 636027
Filing Date: 1975-11-28
Publication_date: 1977-02-08
Assignee: Bell Telephone Laboratories, Incorporated (Murray Hill, NJ)
Primary Class(es): 379/22.01 379/223, 379/240, 379/333
Other Classes:
US Patent Ref:

2092465	Sep, 1937	Matthies	179/26.
3341662	Sep, 1967	Cerny et al.	179/27.
3364313	Jan, 1968	Scheinman	179/27.
3484560	Dec, 1969	Jaeger et al.	179/27.
3731000	May, 1973	Joel	179/8.

Other Refs:
Primary Examiner: Cooper, William C.
Assistant Examiner:
Attorney: Landis; Martin S.