Apple's QuickTime Conferencing ISDN Kit does NOT contain an NT-1 (Network Terminal Adaptor) which terminates the ISDN line at the users end, and powers the ISDN line from the Network Interface box to the ISDN device. An NT-1 is needed for a BRI ISDN connection which has two B channels and one D channel.
Users will need to purchase an NT-1. Their cost may run in the $150 to $400 range depending on features, like Caller ID and so on. A basic NT-1, without Caller ID, will do the job as well as the best model.
An NT-1 is easily obtainable. Your local telephone provider may offer to sell you one, or you can purchase one from the following companies:
Companies Phone Number Model Name
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Quicomm 1-800-244-3688 NT-1 Network Terminator
Intellicom 1-800-884-ISDN Various models
PicturePhone Direct 1-800-810-9966 Tone Commander NT1U-220TC
NOTE: Because an ISDN line needs power and would be unusable in the event of a power outage, a user might also consider connecting the NT-1 to a UPS (Uninterruptable Power Supply).