Siemens Hicom 150 H Operating Instructions Manual page 15

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To activate ISDN-type services and features through the
network carrier's analog trunks or those of other com-
munication systems (such as "consultation hold"), you
must send a signal to the trunks before dialing the ser-
vice code or telephone number.
Precondition: You have set up an external connection
via an analog line.
( ) Enter the code.
Enter the service code and/or telephone number.
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If this function has been configured (contact System
Support), you can use your telephone as a dialing aid for
other telephones.
Lift the handset.
Enter the code.
Enter the internal station number of the party for whom
you want to dial.
Enter the number you wish to dial (external number
with external code).
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