Call progress capability for a switched channel data service unit
Number of patents in Portfolio can not be more than 2000
United States of America
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-
Jun 15, 1999
Grant Date -
N/A
app pub date -
Oct 21, 1993
filing date -
Feb 9, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
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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