Control of incoming and outgoing calls in a key system

Details Control of incoming and outgoing calls in a key system Control of incoming and outgoing calls in a key system

1992-01-29

1993-10-05

Schreyer, S. D.

Telephonic communications

Multi-line or key substation system with selective switching...

Switching or supervision feature

379164, H04M 172

Patent

active

052512541

ABSTRACT:
This invention relates to a communication apparatus which avoids interruption in the operation for an outgoing call of the first party from an extension telephone apparatus. In the case where there is conflict between an incoming call from the third party and an outgoing call from the first party in a selected unoccupied communication line, a call signal is transmitted to the all open extension telephone apparatus, at the same time, an other unoccupied communication line is automatically selected for the outgoing call. Accordingly, the conflict is avoided and the incoming call needs not be responded at the first party's telephone extension when a telephone number is being inputted, however, the fact that a call from the third party has been received is signaled on all open telephone extensions and can be answered there.

REFERENCES:
patent: 4817132 (1989-03-01), Chamberlin et al.
patent: 5001744 (1991-03-01), Nishino et al.

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