Instruction manual

ISDN trunks
Issue 4 May 2003 131555-233-767
ETSI functionality
The full set of ETSI public-network and private-network ISDN features is
officially supported. This includes Look-Ahead Interflow (LAI), look-ahead
routing, and usage allocation.
Also included is all QSIG supplementary services, such as:
■ Name identification
■ Call diversion (including rerouting)
■ Call transfer
■ Path replacement
ETSI functionality does not include:
■ DCS
■ Non-facility associated signaling
■ D-channel backup
■ Wideband signaling
Facility and non-facility associated signaling
Facility and non-facility associated signaling allows an ISDN-PRI DS1/E1
interface D-channel to carry signaling information for B-channels (voice or data).
D-Channel Backup can also be administered to increase system reliability.
Feature plus
Feature plus enables those users without DID service to direct dial users on a
remote PBX through the public network. ISDN feature plus eliminates the need
for attendant intervention for those without DID capabilities.
ISDN-Basic Rate Interface (ISDN-BRI)
Enables connection of the system to equipment or endpoints that support an
Integrated Services Digital Network (ISDN) by using a standard format called the
Basic Rate Interface (BRI). This feature is a 192-Kbps interface that carries two
64-Kbps B-channels and one 16-Kbps D-channel.
ISDN is a global access standard that uses a layered protocol. It eliminates the
need for multiple, separate access arrangements for voice, data, facsimile, and
video services and networks. Using the same pair of wires that carry simple
telephone calls, ISDN can deliver voice, data, and video services in a digital
format.