Operation Manual

206 NetWare MultiProtocol Router for ISDN 3.1 Installation and ISDN Configuration Guide
Interface 1 and Interface 2 have no MSN, EAZ or DDI or listen to the same MSN, EAZ or DDI.
Consequence
Since no unique MSNs, EAZs or DDIs are configured for each of the interfaces, the ISDN-Controller can-
not decide to which interface the incoming call is addressed and tries to pass it on to any interface. If the
call is addressed to interface 1, it will be rejected, because incoming calls are not processed on interface
1. One charge unit is wasted by Router B.
ISDN Connection Monitor Thresholds Set Unequally On One ISDN-
Controller
ISDN Connection Monitor Thresholds should always be configured
equally on each interface of an ISDN-Controller if no unique MSNs,
EAZs or DDIs are used of if the interfaces listen to the same MSN,
EAZ or DDI. Otherwise, the following occurs:
Situation
Router A:
Interface 1: Thresholds configured
Interface 2: No Thresholds configured.
Interface 1 and Interface 2 have no unique MSNs, EAZs or DDIs or listen to the same MSN, EAZ or DDI.
- Router B calls Router A when interface 1 is barred by the ISDN Connection Monitor.
Consequence
Since no unique MSNs, EAZs or DDIs are configured for each of the interfaces, the ISDN-Controller can-
not decide to which interface the incoming call is addressed and tries to pass it on to any interface. If the
call is addressed to interface 1, it will be rejected, because interface 1 is barred by the ISDN Connection
Monitor. One charge unit is wasted by Router B. The main purpose of the ISDN Connection Monitor, i.e.
barring the router completely for incoming calls when one threshold is reached, cannot be fulfilled. A
solution for this is the configuration of an Interface Group. When a threshold is reached on one of the
interfaces belonging to an Interface Group, all interfaces of this group are barred for incoming and outgo-
ing calls.
Using CLI Number Check
If you want to use CLI number check, make sure that a CLI number
check (Only Registered Numbers: CLI or Only Registered Numbers:
CLI and Caller-Specified) is performed on each interface of an ISDN-
Configur.pm6 27.05.97, 12:33206