Telephone apparatus for invalidating incoming call signals durin

Details Telephone apparatus for invalidating incoming call signals durin Telephone apparatus for invalidating incoming call signals durin

1991-03-14

1995-05-30

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Substation originated

379372, 379373, 379355, 379215, H04M 127

Patent

active

054209188

ABSTRACT:
Provided is an exchange system accommodating an ISDN circuit as a line wire, in which a channel of the line wire is capable of being selected by an operation performed at a connected telephone. If, in a state where the ISDN circuit has been selected by the connected telephone, a terminating request which has designated the channel in the selected state is received and this terminating request is answered, the selected state on the side of the connected telephone is cancelled. As a result, the operator on the transmitting side can be informed of the fact that the transmitting operation has been interrupted. Further, by denying the received terminating request which has designated the channel in the selected state, a situation in which a transmission from the selected channel can no longer be made is eliminated. Moreover, by performing control in such a manner that the terminating request is answered using another channel when the terminating request which has designated the channel of the ISDN circuit in the selected state is received, a situation in which a transmission from the selected line wire can no longer be made is eliminated. Performing such control improves the operability of the exchange system.

REFERENCES:
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"Modelling And Traffic Engineering In The Access and Switching Part Of The ISDN" by J. Labetoulle; GLOBECOM '87, 15-18th Nov. 1987, session 14, paper 6, vol. 1, pp. 545-549 IEEE, New York, USA.

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