Avaya Communication Manager Administrator's Manual page 1583

Private network services
In addition to providing access to switched-public networks, ISDN provides private-network services by
connecting Avaya Communication Manager in an ETN, DCS, or QSIG Network. This gives you more
efficient private networks that support new integrated voice and data services. ETN, DCS, and QSIG
networking services are provided as follows.
ETN services
Avaya Media Servers that function as tandem nodes in an ETN can be interconnected using DS1 trunking
facilities with ISDN. All signaling between the tandem switches is done with ISDN D-channel and
normal ISDN protocol. The ISDN can also be used to connect ETN tandem and main servers or switches.
In this case, the main server or switch collects all of the address digits from local users as well as users at
other satellite and tributary switches, and originates a call over ISDN to the tandem server or switch.
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 server or 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 media servers or 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. Avaya Communication Manager 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.
Administrator's Guide for Avaya Communication Manager
November 2003
Feature Reference
ISDN service
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