ISDN comes in two formats; ISDN2 and ISDN30, and both can be used for voice and data communications.
ISDN2 is delivered in pairs per circuit, therefore the entry point is 2 channels (lines), scalable up to 8 (4 circuits).
ISDN30 provides the same functionality as ISDN2 but can scale-up to provide 30 channels (lines) per individual circuit.
Both ISDN options are typically used to act as phone lines connected to a traditional, on-premise telephone system.
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