A single ISDN2 box as per the illustration will deliver 1 line = two channels per box and can be used to deliver both call traffic and data. If used for voice then each voice call would use 64kbit to guarantee good quality and would need to connect to a telephone system as you cannot plug a telephone directly into the box. For data it bonds the 2 channels together giving a speed of 128kbit which is great for credit card machines and similar terminals as the data transmits twice as fast. Ideal for busy environments. If you require more than 4 lines = 8 channels then you would need to upgrade to ISDN30.
ISDN lines will only work on a telephone system or Router capable of connecting with an ISDN circuit.
Unlike analogue lines ISDN lines offer enhanced services such as direct dialling numbers (DDI), Calling line identity (CLI), Call Divert and Caller redirect.
ISDN although still widely used throughout the BT network has been greatly superseded by SIP (Session Initiated Protocol) trunks and now hosted Telephony like the new Horizon Hosted Telephone System.
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