Line switching apparatus and method

Details Line switching apparatus and method Line switching apparatus and method

1989-05-12

1991-02-05

Dwyer, James L.

Telephonic communications

Special services

Repetitive call attempts

379201, H04M 348

Patent

active

049912038

ABSTRACT:
A line switching apparatus includes receiving circuitry for receiving a line-connection request signal from an extension, discriminating circuitry for determining whether a connection is possible to the line when the connection request signal is received from the receiving circuitry, sending circuitry for sending a busy signal to the extension when the discriminating circuitry determines that connection to the line is impossible, detecting circuitry for monitoring the status of the line during sending of the busy signal by the sending circuitry, and detecting that the line is in a connectable state, and alarm circuitry for informing the extension of the fact that the line has been detected to be in the connectable state by the detecting circuitry.

REFERENCES:
patent: 3344235 (1967-09-01), Green et al.
patent: 4166929 (1979-09-01), Sheinbein
patent: 4759055 (1988-07-01), Okumura et al.

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