Toa D-901 KR - Manual (Page 70)

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17.5. Contact Output Function Assignment
17.5.1. Memory selection
Assign the preset memory number (1 – 16) call tally to the terminal.
Step 1. Press each terminal's Function button to select "Memory" from the pull-down menu.
Step 2. Press the Parameter button to select the preset memory number from the pull-down menu.