Siemens Hicom 150 H Operating Instructions Manual page 46

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If this feature is configured (contact System Support),
you can also activate the door opener Æ page 11 in
other Hicom 150 H systems.
Lift the handset.
Enter the code.
Enter the (DISA) call number of the Hicom 150 H in
which the door is to be opened.
Enter.
Enter the (DISA) call number of the telephone from
which you wish to activate the door opener.
Enter.
Enter the code.
Enter the call number of the entrance telephone.
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