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All links of ISDN
The Siemon Company
Estech Systems, Inc
Commetrex Corporation
North Hills Signal Processing
HFCL
SPC TelEquip
The Andrew Yule Group
Nassa Faraday
Gem Electronics
Haven Technology
NP Technologies, Inc.
Innerduct
Underground Devices, Incorporated
Fortec, Inc.
Bizfon
Telesource Online
Magnetek Telecom Power Systems
Telect, Inc.
Proctor & Associates, Inc.
Power & Tel Supply Co.
AOC Technologies Inc.
R.L. Drake Company
Compuspec Industries
Lelux Electronic Ltd.
Union Special Tech Corp.
Tele Tong Enterprise Co., Ltd.
Bogen Communications International Inc.
Decatel Electronic
Huiyuan Electronic Technology
Datafield Industries HK Ltd
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eyeSDN beäugt Ihren ISDN-Verkehr
ISDN Tutorial
CAPI 2.0 - the ISDN interface
Dan Kegel's ISDN Page
Phil McKerracher's ISDN tutorial
Isdn Audio Codec
ComISDN
IISDnet
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