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AVM ISDN MultiProtocol Router for Windows 2000 ADSL Manual

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Reducing Connection Costs
49 NT/MPRI – 3 Configuration and Operation of the NT/MPRI: The Basics
When spoofing is used in Novell NetWare environments, the NT/MPRI
locally answers the packets sent to a remote client by the host part of a
service or application, such as the IPX watchdog packets sent by the
NetWare server or the SPX watchdog packets sent by the host part of
an application.
When an ISDN connection has been set up and spoofing negotiated
between the two systems, the spoofing is performed for the entire du-
ration of the logical connection.
Spoofing must be supported and activated at both ends of the connec-
tion.
Thresholds and Budgets
To control ISDN costs the NT/MPRI offers the option of setting limits on
ISDN charges and on the number of outgoing calls.
These limits are defined using the command “Configuration / Server
Settings / Thresholds”. These settings are valid for the entire router
and serve to limit global maximum values on ISDN charges (Budget),
the duration of physical connections and the number of outgoing calls
(including failed attempts and D-channel signaling). The limits set here
apply to all outgoing dial-up connections of the NT/MPRI and are de-
signed to prevent unexpected ISDN connection costs. When a global
threshold is reached, the NT/MPRI clears down all existing outgoing
physical connections and blocks all further outgoing calls.
An individual budget may also be specified for each call destination. A
call destination budget specifies the maximum charges per day, week
or month which may incur for connections to this destination. It is not
necessary to enter all three values. As soon as the charges calculated
by the NT/MPRI exceed one of the configured budget limits, the physi-
cal ISDN connection is immediately cleared down, and further calls to
the call destination (including D-channel signaling) are blocked. The
logical ISDN connection is not automatically cleared down, however: if
packets need to be transmitted to the call destination, as many at-
tempts are made to dial up the physical connection as you specified
under “Redialing”.
If charge information is received from your ISDN line or PBX extension
during the connection (in accordance with the European standard
AOCD = Advice On Charge During Call), the NT/MPRI uses this informa-
tion to calculate the charges incurred and compares the result with the
configured limit. If your ISDN line or PBX extension does not communi-
ntmpri-e.book Seite 49 Donnerstag, 28. Februar 2002 11:26 11
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