Ring back tone transmission system

Details Ring back tone transmission system Ring back tone transmission system

1985-04-24

1987-05-05

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 65, H04J 312, H04Q 1104

Patent

active

046637591

ABSTRACT:
In a digital and electronic switching apparatus, each subscriber's circuit is provided with a loop back circuit which selectively return a downward channel signal to an upward channel in order that a ring back tone informing a calling telephone set of the fact that a called telephone set is being dialed can be synchronized with a ringing tone dialing a called telephone set. Upon dialing a called subscriber, the loop back circuit is ON-OFF controlled in synchronism with the ON-OFF control of the ringing tone so that a tone signal generated from a common continuous ring back tone source can be transmitted to the loop back circuit and the calling telephone set via a speech path of a switching network.

REFERENCES:
patent: 3899642 (1975-08-01), Jones et al.
patent: 4110562 (1978-08-01), Moed
patent: 4172214 (1979-10-01), McDonald et al.
patent: 4480330 (1984-10-01), Magnusson et al.

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