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Configuration
The rule set has to re-route all incoming calls from the Trunk, respectively all calls incoming on this interface,
back to ISDN. For this, a new rule for incoming calls (Calls from ISDN) is created with the target ISDN:
Image 3.58: Routing Trunk to ISDN
The calls are in must cases supposed to be issued to a defined interface. It is therefore advisable to name the
routing rules in relation to their function. In any case it is needed to use a unique combination of characters in front
of the call number under
Replace
so that calls can be identified properly.
Linking to the PBX
For the second interface to be connected to the PBX properly, usually a cross ISDN cable as well as the NT mode
are needed.
Image 3.59: Advanced Connection Parameters
Additionally, a timeout has to be set for outbound calls from the PBX to the Trunk.