Siemens Hicom 150 H Operating Instructions Manual page 48

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If this feature is configured (contact System Support),
you can also control relays Æ page 37 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 relay is to be controlled.
Enter
Enter the (DISA) call number of the telephone from
which you wish to control the relay.
Enter
or Enter the code for "on" or "off".
... Enter the relay.