Operation Manual

Introduction to NetWare MultiProtocol Router for ISDN 3.1 25
Survey of Important ISDN-Specific Features
Toll-Saving Features
access to ISDN from their networks and whether Unrestricted
Digital Information (UDI) is enabled on the switches, allowing the
service "data transmission" to be used in addition to voice transmis-
sion. This implementation is included in the NetWare MultiProtocol
Router for ISDN drivers for DSS1 and 1TR6.
Direct Acess and Access through PBXs
NetWare MultiProtocol Router for ISDN is dedicated to ISDN and
offers a large number of features especially designed for optimum
use of ISDN. The following sections give a survey and explanations
on important features and discuss conceptional issues on ISDN use
and functions that you should keep in mind.
AVM´s ISDN-Controllers for both, BRI and PRI can be installed
directly at public ISDN accesses as well as at any PBX offering
internal BRI or PRI access and uses one of the standardized ISDN D
channel signaling protocols supported by the NetWare MultiProtocol
Router for ISDN.
ISDN is a circuit-switched public network. ISDN connections are
dialed up and charged by the PTT by the duration of the connection
from the first set-up of a B channel until the last B channel is cleared
down. This can be compared with making a phone call: you pick up
the phone and dial a number. As soon as the call is answered by the
remote site, charges accrue.
Some PTTs also charge call set-up over the D channel, disregarding
whether the B channel was set up or not. When compared with a
phone call, this means that as soon as the phone at the remote site
rings, a charge unit accrues.
Thus, all features that save charges are important. In the following,
toll-saving features are classified according to how they work,
whether they save charges by generally optimizing ISDN use for
internetworking via ISDN-specific timers, by optimizing network,
protocol or application-specific behavior through filters and spoof-
Introduc.pm6 27.05.97, 21:0325