ISDN Tutorial
ISDN Tutorial: History, concepts, references, and more
http://www.ralphb.net/ISDN

eyeSDN beäugt Ihren ISDN-Verkehr
Schicht-1-Monitor am S0-Bus des ISDN-Mehrgeräte-Anschlusses / Layer-1 Monitor at the S/T bus of the ISDN Basic Rate Interface
http://www.mosesele.de/eyesdn/

OS/2 Warp - ISDN und WAN
Informationen zu ISDN und Wide Area Networking.
http://www.wan2.de/isdn/

Turbiville, Pete
Pete Turbiville. Nationally recognized commercial voice over talent with in-house ISDN studio. Strong credits. Listen to online demos.
http://www.peteturbiville.com/

Phil McKerracher's ISDN tutorial
ISDN tutorial
http://www.mckerracher.org/isdn

Tone Commander
Tone Commander, telecommunications manufacturer - ISDN and VoIP Centrex telephones, NT1 ISDN Network Terminations, ISDN and analog Centrex attendant consoles.
http://www.tonecommander.com/

ISDN-Objects
ISDN-Objects for Borland Delphi. Rapid ISDN, SMS, FAX, CTI, X.31 and Voice application development.
http://www.isdn-objects.de/

Hans Paul Pfeiler
Siemens HiPath und Hicom TK-Systeme, ISDN, Fernmeldetechnik,Telefon,Montage und Wartung. Hans P. Pfeiler Handwerksbetrieb und Fachhandel in Stuttgart.
http://www.pfon.de/

ISDN-Software Calling-Us
Bietet Beschreibung der ISDN-Software zur multiplen Kommunikationslösung via Internet, Telefon und Fax, Downloadmöglichkeit sowie Presseinformationen, FAQ und Support.
http://www.media21.de/calling-us/index.html

Isdn Audio Codec
ISDN Codecs at ISDNAUDIO.COM. For the best prices on ISDN Audio Codecs anywhere in the world! Check out our new isdn discussion area for recommendations or help with codecs
http://www.isdnaudio.com/