Samsung OfficeServ DS-5012L - Other Call Functions; Last Number Redial

Making Calls DS/ITP-5012L Phone User Guide
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4. Other Call Functions
The following functions are available for making both intercom and outside
call.
Last Number Redial
Press and hold the [Send] button while in standby
mode.
The phone redials the last telephone number
that you dialled.
You can make a call through the speakerphone
or handset. You can switch from the speaker to the
handset simply by lifting the handset.