AT&T SYSTEM 25 User Manual page 10

DDCs and PDCs
When your System 25 was installed, Data Dial Codes (DDCs)
were assigned to data terminals and Personal Dial Codes (PDCs)
were assigned to voice terminals. In most cases, your PDC is
your extension number.
Visitors and those who don't have exclusive use of a voice
terminal may have been assigned Floating Personal Dial
Codes (FPDCs).
This Guide
This guide has two feature sections: Attendant features and
Standard Multiline features. The Attendant section describes the
features you will use as an Attendant. The Multiline section
describes the features that are available to you and all other
multiline voice terminal users. For your convenience, the
features are arranged in alphabetical order. This guide also
includes certain reference information you may want to review at
a future time.
For Additional Information
See your System Administrator if you have any questions or
would like additional information about your System 25 features.
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