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Support tips for 3Com's ISDN products.

Cameron Communications Group

ISDN telephones, NT1's and videoconferencing products, ISDN training and consulting.

CAPI 2.0 - the ISDN interface

COMMON-ISDN-API: CAPI - the ISDN interface

Cause Codes

Netopia ISDN router info, Cause Codes or ISDN errors.

ISDN Tutorial

A technical introduction to ISDN - history, terminology, protocol, references and ISDN book store.


ISDN modems for Internet access for LANs and home networks.

Patapsco's High-Speed ISDN Systems.

ISDN products including leased line backup, aggregation, protocol conversion and bandwidth on demand.Designed for commercial users, carriers and PTTs.

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