ISDN Unit (Not for U.S.)
Depending on the configuration, it may be necessary to adapt the ISDN unit of the system to an ISDN trunk to display the call charges as a monetary amount. The ISDN unit supplied by the network depends on the carrier.
You can determine this unit for each trunk group (for external code 0, for example).

Step by Step
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Prerequisite: you must have started system administration .
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Select and confirm.
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Confirm.
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or
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Enter the code (for "US:User Options UK:System admin.-User").
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or
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Enter the code (for "US:Systemadmin. charging UK:System admin.-Charges").
Select trunk group:
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or
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Press these keys.
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or
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Confirm.
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or
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Enter trunk group directly and
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confirm your entry.
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Enter the code.
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or
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Select and confirm.
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Enter a unit.
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If applicable
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Delete the last few characters one by one (on optiset E memory only).
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Confirm your entry.
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