BellSouth Primary ISDN provides 1.54 megabits per second of capacity - the equivalent of a T-1 line.
There are 23 channels available to support voice, data and video services, which can be easily combined or reallocated for greater flexibility. And there is a 24th channel to support signaling between your equipment and the BellSouth network.
Important features include:
Faster call set-up: Carrying the signaling information over a separate channel greatly speeds up the origination, termination or any other changes required to process your calls.
Call-call-service selection: Any channel can carry any type of connection, eliminating single-purpose trunks such as Direct Inward Dial (DID), Direct Outward (DOD), and dedicated video or data lines.
Flexible capacity: If you need to allocate more channels to an application such as videoconferencing, you can do so, in any multiple 64 Kbps.