Apparatus for and method of checking the validity of directory numbers in a device for interfacing communications equipment to a telephone line
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United States of America Patent
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-
Jun 29, 1999
Grant Date -
N/A
app pub date -
Jan 28, 1997
filing date -
Jan 28, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for and method of checking the validity of one or more directory numbers in a device for interfacing communications equipment to a digital telephone line, wherein the device is capable of accessing at least two channels on the digital telephone line, each channel having a directory number associated therewith, including: instructing the device to establish a plurality of protocol layers; initiating a call from the device over a first channel of the digital telephone line to the device over a second channel of the digital telephone line only if the plurality of protocol layers are established; and determining if the call is received by the device over the second channel to check the validity of the directory number associated with the second channel.
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