Private branch exchange

Details Private branch exchange Private branch exchange

1989-10-10

1991-05-28

Brown, Thomas W.

Telephonic communications

Plural exchange network or interconnection

Interexchange signalling

379235, 379257, 379283, H04M 322, H04M 714

Patent

active

050200992

ABSTRACT:
Instead of setting the type of a dial signal for a central office line connected to a private branch exchange to either a DTMF signal or a pulsed signal externally of the private branch exchange, the line is acquired and a DTMF signal is transmitted from the private branch exchange to the line so that the line is recognized as a dial line for the DTMF signal when a dial tone coming from the line disappears but as a dial line for the pulsed signal when the dial tone does not disappear. Results of recognition are set in the private branch exchange and the type of the dial signal for the line is set automatically in accordance with the results.

REFERENCES:
patent: 3330911 (1967-07-01), Cohrt
patent: 3790719 (1974-02-01), Montague et al.

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