Call progress capability for a switched channel data service uni

Details Call progress capability for a switched channel data service uni Call progress capability for a switched channel data service uni

1990-08-28

1991-10-22

Schreyer, Stafford D.

Telephonic communications

Centralized switching system

With generating of call associated substation signal

379229, 379237, H04M 126, H04M 322

Patent

active

050602594

ABSTRACT:
A method and apparatus is provided within an interface to data terminal equipment for obtaining call progress information. The call progress information provides relevant data as to the progress of a call initiated by the data terminal equipment. The interface is designed to be used in a portion of the telephone network that lacks byte alignment. Such portions of the telephone network do not currently receive call progress tones. The interface is preferably a data service unit that includes a receiving means processor and a display means. The data service unit interprets signals sent from the DDA/OCU that encode the presence or absence of call progress tones sent from the destination node of an initiated call.

REFERENCES:
patent: 4028493 (1977-06-01), Brennemann et al.
patent: 4667065 (1987-05-01), Bangerter
patent: 4696031 (1987-09-01), Freudberg et al.

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