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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Features and technical reference
1400ISDN service
20
Automatic Alternate Routing (AAR) and Automatic Route Selection (ARS) are
used with ISDN and DS1 trunking facilities to access ETN facilities. AAR and
ARS are used to collect the dialing information for the call that is originated from
the main switch.
DCS services
ISDN-PRI facilities can be used in a DCS arrangement whenever tie trunks are
used to connect the DCS nodes. Most DCS features are not affected by ISDN-PRI.
However, there is a minor impact on a few of the DCS features, as far as the
functions that the local and remote switches perform.
QSIG services
QSIG networking provides compliance to the International Organization for
Standardization (ISO) ISDN private-networking specifications. The QSIG
Networking platform is supported over the ISDN Basic Call setup protocol.
DEFINITY ECS supports QSIG Supplementary Services.
Wideband Switching (ISDN-PRI only)
Wideband Switching provides support for services that require large bandwidth,
such as high-speed video conferencing. Wideband also supports multiple channel
calls end-to-end. These services have traditionally been handled by dedicated
facilities. With Wideband Switching, dedicated facilities are no longer a
requirement for these large bandwidth services.
Call-by-Call Service Selection
Call-by-Call Service Selection allows the same ISDN trunk group to carry calls to
a variety of services or facilities. Embodied in this feature is the ability to allocate
usage. It provides significant flexibility for creating user-defined incoming and
outgoing services and is used on any ISDN trunk group.
Access to Software Defined Data Network
With ISDN, the SDDN service may be accessed. SDDN provides virtual
private-line connectivity via the switched public network. The services provided
by SDDN include voice, data, and video applications. SDDN services
complement the ISDN voice services.
Access to Switched Digital International
Switched Digital International (SDI) provides 64 kbps of unrestricted connectivity
to international locations via the AT&T Switched Network. It is also the backbone
for the AT&T International ISDN network. SDI complements the ACCUNET
digital service already available to United States locations. This service can be
accessed using Call-by-Call Service Selection. SDI provides economical
high-speed data transfer to international locations.