The QuickTime Conferencing ISDN Kit (NuBus) M4585LL/A allows users of the QuickTime Conferencing Kit to do WAN videoconferencing and collaboration Mac-to-Mac or videoconferencing only Mac-to-PC and Mac-to-Room based system using H.320 hardware codec over Telco-supplied ISDN lines. Includes H.320 codec/ISDN card, H.320 ISDN software and accessory kit.
However, a Network Terminal Adaptor (NT-1) is required to use the QuickTime Conferencing ISDN Kit over a Basic Rate Interface (BRI) ISDN line. The NT-1 terminates the ISDN line at the user's end and powers the ISDN line from the network interface box to the ISDN device. An ISDN line requires power and is unusable in the event of a power outage. Connecting the NT-1 to a Uninterruptable Power Supply is suggested.
A NT-1 can be purchased through your local ISDN provider or you can purchase one from the following companies:
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| Companies | Phone Number | Model Name |
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| Quicomm | 1-800-244-3688 | NT-1 Network Terminator |
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| Intellicom | 1-800-884-ISDN | Various models |
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| PicturePhone Direct | 1-800-810-9966 | Tone Commander NT1U-220TC |
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