Button Feature
Cleaned-up
Used to switch the room status of extensions between Ready and Not
Ready.
Primary Directory Number
(PDN)
Used to make and receive both outside and intercom calls.
Secondary Directory Number
(SDN)
Used to show the current status of another extension, call the extension,
and pick up or transfer calls to it.
26 User Manual
1.1.1 Before Operating the Telephones
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