Call progress capability for a switched channel data service uni

Telephonic communications – Centralized switching system – With generating of call associated substation signal

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379229, 379237, H04M 126, H04M 322

Patent

active

RE0362280

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.

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AT&T Technical Reference PUB 62310, "Digital Data System Channel Interface Specification," (Nov. 1987, Jan. 1988, Oct. 1989, Dec. 1989).
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AT&T Technical Reference PUB 41458, "Special Access Connections to the AT&T Communications Network for New Service Applications," (Oct. 1985, Feb. 1987).
Bellcore Technical Advisory TA-TSY-000077, "Digital Channel Banks--Requirements for Dataport Channel Unit Functions," (Apr. 1986).
J. Bellamy, "Digital Telephony," John Wiley & Sons, Appendix B (1982).

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