15 settings, 1 sound and alerts, 1 adjusting ringer volume – AASTRA DT390 for BusinessPhone User Guide EN User Manual
Page 81: Press menu, select , and press select, Select sound & alerts, and press select, Select volume, and press select, Press ok to save the settings, 2 different ring signals for different call types, Select ring signals, and press select, 3 switching vibrator on and off
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