- AVM
 - ISDN hardware, Kommunikationsprodukte, Netzwerk-Software; ISDN products and networking software. - Teles GmbH
- Specialising in PC/ISDN technology.
- Patriot Scientific Corporation
- Offers Java microprocessors, antenna/radar systems, and ISDN interface products.
- Lava Computer MFG Inc
- Manufactures high speed I/O boards and communications products specialising in com ports for external ISDN terminal adapters.
- Anchor Datacomm
- Manufacturer of datacommunication equipment such as ISDN and modems.
- ACHAB Multimedia Networking Internet Site
- Multimedia, networking and Internet products.
- Hermstedt Communication Products
- ISDN hardware and software products for Macintosh.
- Musicam USA
- Manufacturer of digital audio codecs and digital products for the telecommunications, satellite, and professional audio industries.
- Stollmann ISDN E+V GmbH
- Manufacturer of ISDN and X.25 products.
- ISDN*tek
- Provides hardware for high speed access to the ISDN phone system
- DATAX
- ISDN backup and overflow units for BRI and pr., multiplexers-modems for 2mbit/s high speed lines.
- Lightning Instrumentation
- Manufactures ISDN Routers and Leased Line+ISDN Routers, MultiCom.
- Controlware GmbH
- ISDN Backup Systems and Terminal Adapters. X.25 access devices and modems. Large system integrator which installs and manages international data networks.
- Patapsco Designs Ltd.
- ISDN leased line backup products and other ISDN systems such as PRI to BRI conversion and bandwidth on demand.
- Conware Computer Consulting GmbH
- Routers and Bridges for ISDN supporting PPP, IP, IPX and Appletalk and firewall functions (in German).
- Eznet Total Access
- Internet/intranet and networking service provider.
- Intraplex, Inc
- Manufacturer of ISDN codecs and T1 & E1 multiplexers for the broadcast and mobile radio industries.
- ISDNAUDIO.COM
- Offers broadcast ISDN audio equipment and codecs.
- TeleSoft
- Developer of ISDN software and hardware solutions for the OEM and ODM markets.
- AudioTX
- Provides software-only ISDN codec, additionally capable of live audio transmission over IP networks, for broadcast and professional audio use.
- CoFax Telematica srl
- Offers ISDN services.
- Eastern Independent Telecommunications Ltd. (EIT)
- Synapse Communications, Inc.
- Intec
- ISDN engineering and products; offers ISDN engineering services, protocol stacks and products: ISDN PC cards, PBX and testers.
- Hermstedt UK
- Distributors of ISDN TA's and software for Macintosh computers.
- CoSystems, Inc.
- Offers hardware and software for portable, scalable and modular data communications technologies such as ISDN, Frame Relay, MultiLink PPP and X.25 to OEMs, systems integrators, and end users.
- Loopback
- Provides remote circuit loops for testing video-conferencing and ISDN equipment
- ith Kommunikationstechnik GmbH
- Mic ISDN Card for DOS/Windows 3.x/95 (modem emulation), OS/2, Novell Netware 3.x-4.x, SCO Unix, Linux.
- Digifon
- Features a catalogue of ISDN CODECs for Pro Audio users and a listing form for adding your facility to the directory of users.
- ACS Inc.
- Telenetworks
- Provides portable WAN protocol source code for developers. Including ISDN-BRI and PRI, X.25, V.120, Frame Relay and ATM.
- CICAT Networks
- Arca Technologies
- Emutel, Emutel Pro and the Emutel Max will simulate an ISDN central office switch.
- Merge Technologies Group
- A manufacturer of ISDN and BRI testing, development and demonstration equipment.
- IDS Technologies, Inc.
- Distributor of IDSN telephones and equipment. Also offering repair and refurbishment.
- KLAS
- Develop ISDN tools and Windows driver software utilities for ISDN.
- IntelliPRIMA
- Windows PC remote control software for the CDQ Prima range of ISDN audio codecs for broadcast and pro-audio users.
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