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158 / ISDN PRI and BRI
Modular ICS 4.0 System Coordinator Guide P0881591 Issue 01
ISDN BRI
Modular ICS 4.0 supports a maximum of 30 ISDN sets on the
system.
The following ISDN services are supported:
• incoming calls
• outgoing calls
• Calling Line Identification Presentation
• Sub-addressing
• bearer capabilities
• teleservices
The Call Forward All Calls feature can be used from ISDN
terminals connected to Modular ICS.
Note: Norstar sets can accept voice calls only. Video and data
calls do not alert at a Norstar set.
Although an ISDN S-loop or LT-loop can support up to eight
devices, the loop has a limit of two B-channels. If both B-
channels are in use, other devices on that loop cannot make or
receive calls until a B-channel is available, or until both B-
channels are available in the case of a video terminal. Thus, the
number of terminals installed must take into account whether
you require dedicated access for the terminals on that loop.
Note: Norstar set features, other than Transfer and Call
Forward All Calls, are not available to ISDN terminals.
In addition, you cannot retrieve a parked call, or reach
a Direct-Dial set by using the Direct-Dial digit from an
ISDN terminal.
p0881591.book Page 158 Wednesday, August 19, 1998 6:43 PM