Apparatus for and method of checking the validity of directory n

Details Apparatus for and method of checking the validity of directory n Apparatus for and method of checking the validity of directory n

1997-01-28

1999-06-29

Hsu, Alpus H.

Multiplex communications

Diagnostic testing

Of a switching system

370420, 370524, 379 9306, 379243, H04J 314, H04M 1100

Patent

active

059178078

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.

REFERENCES:
patent: 5012466 (1991-04-01), Buhrke et al.
patent: 5315595 (1994-05-01), Allouis et al.
patent: 5317630 (1994-05-01), Feinberg et al.
Screen Printout of U.S. Robotics Sportster ISDN 128K Terminal Adapter diagnostic message--Isdnhelp1.txt, printed Jan. 23, 1997.
Screen Printout of U.S. Robotics Sportster ISDN 128K Terminal Adapter diagnostic message--Isdnhelp2.txt, printed Jan. 23, 1997.
Screen Printout of U.S. Robotics Sportster ISDN 128K Terminal Adapter diagnostic message--Isdnhelp3.txt, printed Jan. 23, 1997.

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