Siemens Hicom 150 H Operating Instructions Manual page 21

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If necessary
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You can assign external calls to certain projects.
Precondition: System Support has set up account
codes for you.
Lift the handset.
Enter the code.
Enter the account code.
Press this key (may be needed, depending on the con-
figuration; contact System Support).
Enter the number of the external station.
You can also enter the account code during an
external call.
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