Call progress tone system

Details Call progress tone system Call progress tone system

1985-10-25

1987-05-26

Dwyer, James L.

Telephonic communications

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

Switching or supervision feature

379353, 379361, 379375, H04M 300

Patent

active

046691103

ABSTRACT:
A tone source is located at each telephone set of a private branch exchange (PBX) or a key telephone system. The tone source provides call progress tones and warble ring tone, as well as a feedback tone in response to the depression of telephone set keypad buttons by the user. The signaling to the central system unit is transmitted via a digital link.

REFERENCES:
patent: 4322581 (1982-03-01), Christain et al.
patent: 4571462 (1986-02-01), Junssen

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